Functional Anatomy — MCQs

Q: What is the fastest acting receptor/transduction mechanism?

Intrinsic ion channel operation. **Explanation:** The speed of a receptor's response is determined by the number of biochemical steps involved between ligand binding and the final physiological effect. **Why Option C is Correct:** **Intrinsic ion channel operation** (also known as **Ionotropic receptors**) represents the fastest transduction mechanism. In these receptors (e.g., Nicotinic ACh receptors, GABA-A receptors), the receptor itself is an ion channel. Upon ligand binding, the channel undergoes an immediate conformational change to allow ion flow [1]. This process occurs within **milliseconds**, making it ideal for rapid neurotransmission and muscle contraction. **Why the other options are incorrect:** * **Options A & B (G-Protein Coupled Receptors - GPCRs):** These utilize the Adenylyl cyclase and Phospholipase C pathways. They are slower because they require a "middleman" (G-proteins) and the generation of second messengers (cAMP, IP3, DAG). Their response time is typically in **seconds**. * **Option D (Nuclear Receptors):** These are the slowest. They involve ligand transport into the nucleus, binding to DNA, and subsequent gene transcription and protein synthesis. This process takes **hours to days**. **NEET-PG High-Yield Pearls:** * **Fastest to Slowest Sequence:** Ionotropic (ms) > Metabotropic/GPCR (seconds) > Enzyme-linked (minutes) > Nuclear receptors (hours/days). * **Classic Example:** The **Nicotinic ACh receptor** at the neuromuscular junction is the prototype for rapid ionotropic signaling. * **Clinical Correlation:** Rapid-acting drugs often target ion channels (e.g., local anesthetics blocking Na+ channels), whereas drugs with delayed onset (e.g., Steroids, Thyroxine) act via nuclear receptors.

Q: Which of the following nerves supplies the muscle that is involved in the moment given below?

A. Spinal accessory nerve. ***A. Spinal accessory nerve*** - This nerve provides motor innervation to the **Trapezius muscle**, which is responsible for elevation (shrugging) and retraction/rotation of the scapula, allowing the movement described. - It also innervates the **Sternocleidomastoid muscle**, which is crucial for turning the head to the opposite side and neck flexion. *B. Long thoracic nerve* - The long thoracic nerve supplies the **Serratus anterior** muscle, which protracts the scapula and stabilizes it against the chest wall. - Damage to this nerve results in **winged scapula**, particularly noticeable when pushing against a wall. *C. Axillary nerve* - The **Axillary nerve** primarily supplies the **Deltoid** (responsible for shoulder abduction after the initial 15 degrees) and the **Teres minor** muscles. - Impairment typically involves difficulty initiating or maintaining shoulder abduction and loss of sensation over the **regimental badge area**. *D. Radial nerve* - The radial nerve is the nerve of the posterior compartment of the arm, supplying all the **extensor muscles** of the upper limb. - It is vital for elbow extension via the **Triceps** and extension of the wrist and fingers, not the primary nerve for scapular movement.

Q: The antagonist of superior rectus is:

Inferior rectus. ***Inferior rectus*** - The **superior rectus** muscle's primary action is **elevation** of the eye, while the **inferior rectus** muscle's primary action is **depression** of the eye, making them direct antagonists. - Additionally, the superior rectus causes **intorsion** (medial rotation) while the inferior rectus causes **extorsion** (lateral rotation), further opposing each other's actions. *Superior oblique* - The **superior oblique** muscle primarily causes **depression** and **intorsion**, but it's not the direct antagonist of the superior rectus. - Its primary antagonist is the **inferior oblique** muscle, not the superior rectus. *Inferior oblique* - The **inferior oblique** muscle causes **elevation** and **extorsion**, which partially opposes some actions of the superior rectus. - However, it's not the direct antagonist as both muscles cause **elevation** as their primary action. *Lateral rectus* - The **lateral rectus** muscle causes **abduction** (outward movement) of the eye. - Its antagonist is the **medial rectus** muscle, and it has no direct opposing relationship with the superior rectus muscle.

Q: Name the muscles being used in climbing a tree as shown in the figure.

Latissimus dorsi and pectoralis major. ***Latissimus dorsi and pectoralis major*** - The **latissimus dorsi** is a large, powerful muscle responsible for adduction, extension, and internal rotation of the arm, all crucial for pulling the body upward during climbing. - The **pectoralis major** is a large, fan-shaped muscle that helps with adduction, flexion, and internal rotation of the humerus, also vital for pulling oneself up against gravity. *Teres major and pectoralis major* - While the **pectoralis major** is involved, the **teres major** is a smaller muscle that primarily assists the latissimus dorsi in extension, adduction, and internal rotation of the humerus, but is not as dominant in the main pulling action as the latissimus dorsi. - The primary pulling force comes from larger muscles, making the teres major a less significant contributor to the overall climbing action. *Teres minor and pectoralis minor* - The **teres minor** is part of the rotator cuff and primarily functions in external rotation of the humerus, which is not a primary movement for pulling oneself up. - The **pectoralis minor** is a small, thin muscle that stabilizes the scapula and depresses the shoulder; it does not directly contribute to the powerful pulling action needed for climbing. *External oblique and pectoralis major* - The **external oblique** is an abdominal muscle involved in trunk rotation and flexion, providing core stability but not directly contributing to the primary upper body pulling motion for climbing. - While the **pectoralis major** is correctly identified, the external oblique is not a primary muscle used for the upward pulling motion in climbing.

Q: What is the action of the muscle marked in the given image?

Elevation. ***Elevation*** - The image shows a coronal section of the head, and the arrow points to the **temporalis muscle**, which is one of the primary muscles of mastication. - The main action of the temporalis muscle is to **elevate the mandible**, closing the mouth. - The **anterior and middle fibers** particularly produce elevation. *Depression* - Depression of the mandible is primarily performed by the **lateral pterygoid muscle** and the suprahyoid muscles (e.g., digastric, geniohyoid). - The temporalis muscle's fiber orientation is not consistent with mandibular depression. *Protraction* - **Protraction** (protrusion) of the mandible is primarily carried out by the **lateral pterygoid muscles** (bilateral contraction). - The temporalis muscle does not contribute significantly to protraction. *Retraction* - **Retraction** of the mandible is indeed performed by the **posterior fibers of the temporalis muscle**. - However, since the question asks about the action of the muscle as shown in the image (likely showing the entire muscle or its anterior portion), and the **primary and most prominent action** of the temporalis as a whole is **elevation**, this is the best answer.

Q: What is the action of the muscle shown in the image below?

Retracts the scapula. ***Retracts the scapula*** - The image highlights the **rhomboid major** muscle, which originates from the spinous processes of T2-T5 vertebrae and inserts onto the medial border of the scapula. - Its primary action is to **retract** (pull medially) and rotate the scapula inferiorly, and also to help hold the scapula against the thoracic wall. *Medial rotation of the shoulder* - Medial rotation of the shoulder is primarily performed by muscles like the **subscapularis**, **pectoralis major**, **latissimus dorsi**, and **teres major**. - The rhomboids do not directly act on the glenohumeral joint for shoulder rotation. *Adduction of the shoulder* - Adduction of the shoulder (bringing the arm towards the body) is mainly performed by the **latissimus dorsi**, **pectoralis major**, and **teres major**. - The rhomboids' action on the scapula indirectly influences shoulder movement but does not directly adduct the shoulder joint. *Extension of the shoulder* - Shoulder extension is primarily achieved by the **latissimus dorsi**, **teres major**, and the posterior fibers of the **deltoid**. - The rhomboid major muscle's action focuses solely on the scapula, not direct extension of the shoulder joint.

Q: Which of the following is the safety muscle of tongue?

Genioglossus. ***Genioglossus*** - The **genioglossus muscle** is considered the safety muscle of the tongue because its contraction pulls the tongue forward, preventing it from falling backward and **obstructing the airway**, especially during sleep or in an unconscious state. - Its forward action is crucial in maintaining a **patent airway** [1]. *Hyoglossus* - The **hyoglossus muscle** depresses and retracts the tongue. - Its primary action is not to prevent airway obstruction, but rather for **tongue movement** during speech and swallowing. *Styloglossus* - The **styloglossus muscle** retracts and elevates the tongue. - It helps in shaping the tongue for **swallowing and speech**, but does not have a primary role in airway patency. *Palatoglossus* - The **palatoglossus muscle** elevates the posterior part of the tongue and depresses the soft palate. - It is involved in initiating **swallowing** and separating the oral cavity from the pharynx, not in preventing airway collapse.

Q: Which of the following muscles causes the forward movement of the condyle in the mandibular fossa?

Lateral pterygoid. ***Lateral pterygoid*** - The **lateral pterygoid muscle** (especially its inferior head) is primarily responsible for **protrusion (forward movement)** of the mandible, causing the condyle to slide anteriorly along the articular eminence in the temporomandibular joint. - Its superior head stabilizes the **articular disc** during jaw movements, while the inferior head produces the forward translation. *Masseter* - The **masseter muscle** is a powerful muscle of mastication primarily involved in **elevation (closing)** of the mandible. - While it can assist slightly in protrusion when both sides contract, it does not produce the forward gliding movement of the condyle. *Medial pterygoid* - The **medial pterygoid muscle** primarily functions in **elevating** the mandible and assists in **protrusion** and grinding movements. - While it contributes to protrusion, the **lateral pterygoid** is the primary muscle responsible for the forward movement of the condyle. *Temporalis* - The **temporalis muscle** is a strong elevator of the mandible and its posterior fibers act as a **retractor**, pulling the mandible backward. - It opposes forward movement and is responsible for retrusion, not protrusion of the condyle.

Q: When forces are applied on the lateral surface of the mandibular angle region, compression is generated on:

Lateral surface. ***Lateral surface*** - When a force is applied to the **lateral surface** of the mandibular angle, this is the **point of direct impact and compression**. - According to **biomechanical principles**, compression occurs at the site where external force is applied to bone [1]. - In bending mechanics, the side receiving the load experiences **compressive stress**, while the opposite side experiences tensile stress [1]. - This principle is fundamental in understanding **mandibular fracture patterns** and surgical plating techniques. *Medial surface* - The medial surface, being **opposite to the point of force application**, experiences **tensile (tension) forces**, not compression [1]. - In beam bending theory, when one side is compressed, the opposite side is under tension [1]. - This is why fracture lines in the mandible often propagate from the tension side (medial) when lateral forces are applied. *Inferior surface* - The inferior border of the mandible is classically described as the **tension side during mastication and functional loading**, not lateral impact forces. - When lateral forces are applied to the angle, the inferior surface experiences complex stress patterns but is not the primary site of compression. - The inferior border-superior border axis is different from the lateral-medial force axis described in this question. *Superior surface* - The superior (alveolar) border typically experiences **compression during mastication**, but this relates to occlusal forces, not lateral impact. - For lateral forces applied to the mandibular angle, the superior surface does not experience primary compression. - This surface is more relevant for bite forces and dental occlusion mechanics.

Q: Which muscle helps in climbing a tree?

Latissimus Dorsi. ***Latissimus Dorsi*** - The **latissimus dorsi** is a large, powerful muscle responsible for **adduction, extension, and internal rotation** of the shoulder joint, all actions crucial for pulling the body upward during climbing. [1] - Its broad attachment helps stabilize the torso and provides the necessary force for **pulling and gripping** movements involved in tree climbing. *Trapezius* - The **trapezius** primarily functions in **shrugging the shoulders**, retracting the scapula, and rotating the head and neck. - While it contributes to overall upper body strength, its main actions are not directly involved in the powerful **pulling motion** required for climbing. *Rhomboideus* - The **rhomboids (major and minor)** primarily act to **retract (pull back) and rotate the scapula** downwards. - These actions are important for stabilizing the shoulder blade but are not the primary movers for the **vertical pulling** associated with climbing. *Levator scapulae* - The **levator scapulae** elevates the scapula and can assist in rotating the neck. - While it contributes to shoulder girdle movement, it does not provide the significant **pulling force** needed to lift the body during climbing.

Functional Anatomy Indian Medical PG Practice Questions and MCQs

Question 1: What is the fastest acting receptor/transduction mechanism?

A. Adenylyl cyclase-cyclic AMP pathway
B. Phospholipase C-IP3:DAG pathway
C. Intrinsic ion channel operation (Correct Answer)
D. Nuclear receptor

Explanation: **Explanation:** The speed of a receptor's response is determined by the number of biochemical steps involved between ligand binding and the final physiological effect. **Why Option C is Correct:** **Intrinsic ion channel operation** (also known as **Ionotropic receptors**) represents the fastest transduction mechanism. In these receptors (e.g., Nicotinic ACh receptors, GABA-A receptors), the receptor itself is an ion channel. Upon ligand binding, the channel undergoes an immediate conformational change to allow ion flow [1]. This process occurs within **milliseconds**, making it ideal for rapid neurotransmission and muscle contraction. **Why the other options are incorrect:** * **Options A & B (G-Protein Coupled Receptors - GPCRs):** These utilize the Adenylyl cyclase and Phospholipase C pathways. They are slower because they require a "middleman" (G-proteins) and the generation of second messengers (cAMP, IP3, DAG). Their response time is typically in **seconds**. * **Option D (Nuclear Receptors):** These are the slowest. They involve ligand transport into the nucleus, binding to DNA, and subsequent gene transcription and protein synthesis. This process takes **hours to days**. **NEET-PG High-Yield Pearls:** * **Fastest to Slowest Sequence:** Ionotropic (ms) > Metabotropic/GPCR (seconds) > Enzyme-linked (minutes) > Nuclear receptors (hours/days). * **Classic Example:** The **Nicotinic ACh receptor** at the neuromuscular junction is the prototype for rapid ionotropic signaling. * **Clinical Correlation:** Rapid-acting drugs often target ion channels (e.g., local anesthetics blocking Na+ channels), whereas drugs with delayed onset (e.g., Steroids, Thyroxine) act via nuclear receptors.

Question 2: Which of the following nerves supplies the muscle that is involved in the moment given below?

A. A. Spinal accessory nerve (Correct Answer)
B. C. Axillary nerve
C. D. Radial nerve
D. B. Long thoracic nerve

Explanation: ***A. Spinal accessory nerve*** - This nerve provides motor innervation to the **Trapezius muscle**, which is responsible for elevation (shrugging) and retraction/rotation of the scapula, allowing the movement described. - It also innervates the **Sternocleidomastoid muscle**, which is crucial for turning the head to the opposite side and neck flexion. *B. Long thoracic nerve* - The long thoracic nerve supplies the **Serratus anterior** muscle, which protracts the scapula and stabilizes it against the chest wall. - Damage to this nerve results in **winged scapula**, particularly noticeable when pushing against a wall. *C. Axillary nerve* - The **Axillary nerve** primarily supplies the **Deltoid** (responsible for shoulder abduction after the initial 15 degrees) and the **Teres minor** muscles. - Impairment typically involves difficulty initiating or maintaining shoulder abduction and loss of sensation over the **regimental badge area**. *D. Radial nerve* - The radial nerve is the nerve of the posterior compartment of the arm, supplying all the **extensor muscles** of the upper limb. - It is vital for elbow extension via the **Triceps** and extension of the wrist and fingers, not the primary nerve for scapular movement.

Question 3: The antagonist of superior rectus is:

A. Inferior rectus (Correct Answer)
B. Superior oblique
C. Inferior oblique
D. Lateral rectus

Explanation: ***Inferior rectus*** - The **superior rectus** muscle's primary action is **elevation** of the eye, while the **inferior rectus** muscle's primary action is **depression** of the eye, making them direct antagonists. - Additionally, the superior rectus causes **intorsion** (medial rotation) while the inferior rectus causes **extorsion** (lateral rotation), further opposing each other's actions. *Superior oblique* - The **superior oblique** muscle primarily causes **depression** and **intorsion**, but it's not the direct antagonist of the superior rectus. - Its primary antagonist is the **inferior oblique** muscle, not the superior rectus. *Inferior oblique* - The **inferior oblique** muscle causes **elevation** and **extorsion**, which partially opposes some actions of the superior rectus. - However, it's not the direct antagonist as both muscles cause **elevation** as their primary action. *Lateral rectus* - The **lateral rectus** muscle causes **abduction** (outward movement) of the eye. - Its antagonist is the **medial rectus** muscle, and it has no direct opposing relationship with the superior rectus muscle.

Question 4: Name the muscles being used in climbing a tree as shown in the figure.

A. Latissimus dorsi and pectoralis major (Correct Answer)
B. Teres major and pectoralis major
C. Teres minor and pectoralis minor
D. External oblique and pectoralis major

Explanation: ***Latissimus dorsi and pectoralis major*** - The **latissimus dorsi** is a large, powerful muscle responsible for adduction, extension, and internal rotation of the arm, all crucial for pulling the body upward during climbing. - The **pectoralis major** is a large, fan-shaped muscle that helps with adduction, flexion, and internal rotation of the humerus, also vital for pulling oneself up against gravity. *Teres major and pectoralis major* - While the **pectoralis major** is involved, the **teres major** is a smaller muscle that primarily assists the latissimus dorsi in extension, adduction, and internal rotation of the humerus, but is not as dominant in the main pulling action as the latissimus dorsi. - The primary pulling force comes from larger muscles, making the teres major a less significant contributor to the overall climbing action. *Teres minor and pectoralis minor* - The **teres minor** is part of the rotator cuff and primarily functions in external rotation of the humerus, which is not a primary movement for pulling oneself up. - The **pectoralis minor** is a small, thin muscle that stabilizes the scapula and depresses the shoulder; it does not directly contribute to the powerful pulling action needed for climbing. *External oblique and pectoralis major* - The **external oblique** is an abdominal muscle involved in trunk rotation and flexion, providing core stability but not directly contributing to the primary upper body pulling motion for climbing. - While the **pectoralis major** is correctly identified, the external oblique is not a primary muscle used for the upward pulling motion in climbing.

Question 5: What is the action of the muscle marked in the given image?

A. Elevation (Correct Answer)
B. Depression
C. Protraction
D. Retraction

Explanation: ***Elevation*** - The image shows a coronal section of the head, and the arrow points to the **temporalis muscle**, which is one of the primary muscles of mastication. - The main action of the temporalis muscle is to **elevate the mandible**, closing the mouth. - The **anterior and middle fibers** particularly produce elevation. *Depression* - Depression of the mandible is primarily performed by the **lateral pterygoid muscle** and the suprahyoid muscles (e.g., digastric, geniohyoid). - The temporalis muscle's fiber orientation is not consistent with mandibular depression. *Protraction* - **Protraction** (protrusion) of the mandible is primarily carried out by the **lateral pterygoid muscles** (bilateral contraction). - The temporalis muscle does not contribute significantly to protraction. *Retraction* - **Retraction** of the mandible is indeed performed by the **posterior fibers of the temporalis muscle**. - However, since the question asks about the action of the muscle as shown in the image (likely showing the entire muscle or its anterior portion), and the **primary and most prominent action** of the temporalis as a whole is **elevation**, this is the best answer.

Question 6: What is the action of the muscle shown in the image below?

A. Medial rotation of the shoulder
B. Adduction of the shoulder
C. Extension of the shoulder
D. Retracts the scapula (Correct Answer)

Explanation: ***Retracts the scapula*** - The image highlights the **rhomboid major** muscle, which originates from the spinous processes of T2-T5 vertebrae and inserts onto the medial border of the scapula. - Its primary action is to **retract** (pull medially) and rotate the scapula inferiorly, and also to help hold the scapula against the thoracic wall. *Medial rotation of the shoulder* - Medial rotation of the shoulder is primarily performed by muscles like the **subscapularis**, **pectoralis major**, **latissimus dorsi**, and **teres major**. - The rhomboids do not directly act on the glenohumeral joint for shoulder rotation. *Adduction of the shoulder* - Adduction of the shoulder (bringing the arm towards the body) is mainly performed by the **latissimus dorsi**, **pectoralis major**, and **teres major**. - The rhomboids' action on the scapula indirectly influences shoulder movement but does not directly adduct the shoulder joint. *Extension of the shoulder* - Shoulder extension is primarily achieved by the **latissimus dorsi**, **teres major**, and the posterior fibers of the **deltoid**. - The rhomboid major muscle's action focuses solely on the scapula, not direct extension of the shoulder joint.

Question 7: Which of the following is the safety muscle of tongue?

A. Genioglossus (Correct Answer)
B. Hyoglossus
C. Styloglossus
D. Palatoglossus

Explanation: ***Genioglossus*** - The **genioglossus muscle** is considered the safety muscle of the tongue because its contraction pulls the tongue forward, preventing it from falling backward and **obstructing the airway**, especially during sleep or in an unconscious state. - Its forward action is crucial in maintaining a **patent airway** [1]. *Hyoglossus* - The **hyoglossus muscle** depresses and retracts the tongue. - Its primary action is not to prevent airway obstruction, but rather for **tongue movement** during speech and swallowing. *Styloglossus* - The **styloglossus muscle** retracts and elevates the tongue. - It helps in shaping the tongue for **swallowing and speech**, but does not have a primary role in airway patency. *Palatoglossus* - The **palatoglossus muscle** elevates the posterior part of the tongue and depresses the soft palate. - It is involved in initiating **swallowing** and separating the oral cavity from the pharynx, not in preventing airway collapse.

Question 8: Which of the following muscles causes the forward movement of the condyle in the mandibular fossa?

A. Masseter
B. Lateral pterygoid (Correct Answer)
C. Medial pterygoid
D. Temporalis

Explanation: ***Lateral pterygoid*** - The **lateral pterygoid muscle** (especially its inferior head) is primarily responsible for **protrusion (forward movement)** of the mandible, causing the condyle to slide anteriorly along the articular eminence in the temporomandibular joint. - Its superior head stabilizes the **articular disc** during jaw movements, while the inferior head produces the forward translation. *Masseter* - The **masseter muscle** is a powerful muscle of mastication primarily involved in **elevation (closing)** of the mandible. - While it can assist slightly in protrusion when both sides contract, it does not produce the forward gliding movement of the condyle. *Medial pterygoid* - The **medial pterygoid muscle** primarily functions in **elevating** the mandible and assists in **protrusion** and grinding movements. - While it contributes to protrusion, the **lateral pterygoid** is the primary muscle responsible for the forward movement of the condyle. *Temporalis* - The **temporalis muscle** is a strong elevator of the mandible and its posterior fibers act as a **retractor**, pulling the mandible backward. - It opposes forward movement and is responsible for retrusion, not protrusion of the condyle.

Question 9: When forces are applied on the lateral surface of the mandibular angle region, compression is generated on:

A. Medial surface
B. Superior surface
C. Lateral surface (Correct Answer)
D. Inferior surface

Explanation: ***Lateral surface*** - When a force is applied to the **lateral surface** of the mandibular angle, this is the **point of direct impact and compression**. - According to **biomechanical principles**, compression occurs at the site where external force is applied to bone [1]. - In bending mechanics, the side receiving the load experiences **compressive stress**, while the opposite side experiences tensile stress [1]. - This principle is fundamental in understanding **mandibular fracture patterns** and surgical plating techniques. *Medial surface* - The medial surface, being **opposite to the point of force application**, experiences **tensile (tension) forces**, not compression [1]. - In beam bending theory, when one side is compressed, the opposite side is under tension [1]. - This is why fracture lines in the mandible often propagate from the tension side (medial) when lateral forces are applied. *Inferior surface* - The inferior border of the mandible is classically described as the **tension side during mastication and functional loading**, not lateral impact forces. - When lateral forces are applied to the angle, the inferior surface experiences complex stress patterns but is not the primary site of compression. - The inferior border-superior border axis is different from the lateral-medial force axis described in this question. *Superior surface* - The superior (alveolar) border typically experiences **compression during mastication**, but this relates to occlusal forces, not lateral impact. - For lateral forces applied to the mandibular angle, the superior surface does not experience primary compression. - This surface is more relevant for bite forces and dental occlusion mechanics.

Question 10: Which muscle helps in climbing a tree?

A. Trapezius
B. Latissimus Dorsi (Correct Answer)
C. Rhomboideus
D. Levator scapulae

Explanation: ***Latissimus Dorsi*** - The **latissimus dorsi** is a large, powerful muscle responsible for **adduction, extension, and internal rotation** of the shoulder joint, all actions crucial for pulling the body upward during climbing. [1] - Its broad attachment helps stabilize the torso and provides the necessary force for **pulling and gripping** movements involved in tree climbing. *Trapezius* - The **trapezius** primarily functions in **shrugging the shoulders**, retracting the scapula, and rotating the head and neck. - While it contributes to overall upper body strength, its main actions are not directly involved in the powerful **pulling motion** required for climbing. *Rhomboideus* - The **rhomboids (major and minor)** primarily act to **retract (pull back) and rotate the scapula** downwards. - These actions are important for stabilizing the shoulder blade but are not the primary movers for the **vertical pulling** associated with climbing. *Levator scapulae* - The **levator scapulae** elevates the scapula and can assist in rotating the neck. - While it contributes to shoulder girdle movement, it does not provide the significant **pulling force** needed to lift the body during climbing.

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