INI-CET 2019

Q: Slow growing alveolar like tumor in liver is caused by:

E. multilocularis. **Correct: E. multilocularis** - *Echinococcus multilocularis* causes **alveolar echinococcosis**, characterized by a slow-growing, infiltrative, and destructive lesion in the liver with a sponge-like, alveolar appearance - This parasite's larval stage forms multiple small cysts that are not encapsulated, leading to a tumor-like mass, often described as having an "alveolar" structure - The growth pattern mimics a malignant tumor, with irregular borders and infiltration into surrounding liver tissue *Incorrect: Amoebic liver abscess* - An amoebic liver abscess is caused by **Entamoeba histolytica** and typically presents as a single or multiple well-defined, encapsulated lesions filled with "anchovy paste-like" pus, which is distinct from an alveolar tumor - These abscesses usually develop relatively quickly (acute to subacute) and are often associated with fever and right upper quadrant pain, unlike the slow, asymptomatic growth of alveolar echinococcosis *Incorrect: E. granulosus* - *Echinococcus granulosus* causes **cystic echinococcosis** (hydatid disease), which typically presents as a single, large, unilocular cyst with a clear, laminated membrane, often surrounded by a fibrous capsule - Unlike *E. multilocularis*, *E. granulosus* cysts tend to be well-defined, spherical, and expansile rather than infiltrative and alveolar - The key distinguishing feature is the **cystic** (unilocular or with daughter cysts) versus **alveolar** (multiple small vesicles) morphology *Incorrect: Cysticercus cellulosae* - *Cysticercus cellulosae* is the larval form of **Taenia solium** and causes cysticercosis, which primarily affects muscles, subcutaneous tissue, brain, and eyes - While it forms cysts, these are typically small, solitary, and calcify in various tissues, not forming a large, infiltrative, alveolar tumor-like mass in the liver - Hepatic cysticercosis is extremely rare [Practice more INI-CET 2019 questions on OnCourse]

Q: The patient who developed a rash on the skin, hypotension, and difficulty in breathing after being given 2 g of ampicillin intravenously should be managed by.

0.5 ml of 1:1000 adrenaline by intramuscular injection. ***0.5 ml of 1:1000 adrenaline by intramuscular injection*** - This presentation describes **anaphylaxis**, characterized by a rapid onset of rash, **hypotension**, and **difficulty breathing** following drug administration. - The immediate and definitive treatment for anaphylaxis is **intramuscular adrenaline (epinephrine)**, typically at a concentration of **1:1000** for rapid absorption and systemic effect. *0.5 ml of 1:1000 adrenaline by intravenous injection* - **Intravenous adrenaline** is generally reserved for patients who are unresponsive to intramuscular administration or are in **cardiac arrest**, as it carries a higher risk of adverse effects like arrhythmias. - The initial, first-line treatment in an evolving anaphylactic reaction should be **intramuscular injection** due to its safer profile and rapid onset of action. *0.5 ml of 1:10000 adrenaline by intramuscular injection* - A concentration of **1:10,000 adrenaline** is typically used for **intravenous administration** during advanced cardiac life support (ACLS) protocols, not for initial intramuscular injection in anaphylaxis. - Administering 1:10,000 adrenaline intramuscularly would provide a **suboptimal dose** for treating severe anaphylaxis effectively. *0.5 ml of 1:10000 adrenaline by intravenous injection* - While intravenous adrenaline uses a **1:10,000 concentration**, it's not the initial route for managing anaphylaxis unless the patient is in **cardiac arrest** or unresponsive to IM adrenaline. - Starting with IV adrenaline carries a higher risk of **cardiac complications** and can be difficult to administer promptly in an emergency outside of a controlled setting. [Practice more INI-CET 2019 questions on OnCourse]

Q: In a clinical scenario where a patient presents with flaccid paralysis, which of the following toxins is most likely responsible?

Botulism. ***Correct Option: Botulism*** - **Botulinum toxin** blocks the release of **acetylcholine** at the neuromuscular junction, leading to **flaccid paralysis**. - This paralysis typically progresses symmetrically and can affect ocular, bulbar, and peripheral muscles. *Incorrect Option: Tetanus* - **Tetanus toxin** inhibits the release of **inhibitory neurotransmitters** (**GABA** and **glycine**) in the central nervous system. - This leads to uncontrolled muscle contractions, presenting as **spastic paralysis** and **lockjaw**. *Incorrect Option: Diphtheria* - **Diphtheria toxin** causes local inflammation and can lead to systemic effects, including **myocarditis** and **neuropathy**. - The neuropathy can cause weakness, but it is typically a **delayed polyneuropathy** rather than acute flaccid paralysis. *Incorrect Option: Cholera* - **Cholera toxin** activates adenylyl cyclase in intestinal cells, leading to excessive fluid and electrolyte secretion. - The primary symptom is **severe watery diarrhea** and dehydration, not paralysis. [Practice more INI-CET 2019 questions on OnCourse]

Q: Golgi tendon organ function is?

Detects the muscle tension. ***Detects the muscle tension*** - The **Golgi tendon organ (GTO)** is a proprioceptor located at the musculotendinous junction, specifically designed to monitor and respond to changes in **muscle tension** or force. - When muscle tension increases, such as during a strong contraction, the GTO sends inhibitory signals to the motor neurons of the same muscle, leading to muscle relaxation and preventing injury (autogenic inhibition). *Detects the dynamic change in muscle length* - This function is primarily attributed to **muscle spindles**, which are specialized sensory receptors that detect changes in the **length** and rate of change of length of a muscle. - Muscle spindles are responsible for the **stretch reflex**, initiating a contraction when a muscle is stretched too quickly. *Detects the muscle stretch* - While GTOs are involved in reflex responses that can follow muscle stretch, their primary role is not to detect the stretching itself, but rather the **tension** that results from that stretch. - **Muscle spindles** are the primary mechanoreceptors responsible for detecting the stretch of a muscle. *Detects the muscle strength* - "Muscle strength" is a broader term referring to the force a muscle can exert, which is controlled by a combination of neural input and muscle fiber characteristics. - While GTOs contribute to the overall proprioceptive feedback regulating muscle force, they specifically detect **tension** rather than directly measuring "strength" as a global concept. [Practice more INI-CET 2019 questions on OnCourse]

5 Previous Year Questions with Answers & Explanations

Questions

Subjects

All (5)Microbiology (1)Pharmacology (2)Physiology (2)

Microbiology

1 questions

Slow growing alveolar like tumor in liver is caused by:

Pharmacology

2 questions

The patient who developed a rash on the skin, hypotension, and difficulty in breathing after being given 2 g of ampicillin intravenously should be managed by.

In a clinical scenario where a patient presents with flaccid paralysis, which of the following toxins is most likely responsible?

INI-CET 2019 - Pharmacology INI-CET Practice Questions and MCQs

Question 1: The patient who developed a rash on the skin, hypotension, and difficulty in breathing after being given 2 g of ampicillin intravenously should be managed by.

A. 0.5 ml of 1:1000 adrenaline by intravenous injection
B. 0.5 ml of 1:10000 adrenaline by intramuscular injection
C. 0.5 ml of 1:10000 adrenaline by intravenous injection
D. 0.5 ml of 1:1000 adrenaline by intramuscular injection (Correct Answer)

Explanation: ***0.5 ml of 1:1000 adrenaline by intramuscular injection*** - This presentation describes **anaphylaxis**, characterized by a rapid onset of rash, **hypotension**, and **difficulty breathing** following drug administration. - The immediate and definitive treatment for anaphylaxis is **intramuscular adrenaline (epinephrine)**, typically at a concentration of **1:1000** for rapid absorption and systemic effect. *0.5 ml of 1:1000 adrenaline by intravenous injection* - **Intravenous adrenaline** is generally reserved for patients who are unresponsive to intramuscular administration or are in **cardiac arrest**, as it carries a higher risk of adverse effects like arrhythmias. - The initial, first-line treatment in an evolving anaphylactic reaction should be **intramuscular injection** due to its safer profile and rapid onset of action. *0.5 ml of 1:10000 adrenaline by intramuscular injection* - A concentration of **1:10,000 adrenaline** is typically used for **intravenous administration** during advanced cardiac life support (ACLS) protocols, not for initial intramuscular injection in anaphylaxis. - Administering 1:10,000 adrenaline intramuscularly would provide a **suboptimal dose** for treating severe anaphylaxis effectively. *0.5 ml of 1:10000 adrenaline by intravenous injection* - While intravenous adrenaline uses a **1:10,000 concentration**, it's not the initial route for managing anaphylaxis unless the patient is in **cardiac arrest** or unresponsive to IM adrenaline. - Starting with IV adrenaline carries a higher risk of **cardiac complications** and can be difficult to administer promptly in an emergency outside of a controlled setting.

Question 2: In a clinical scenario where a patient presents with flaccid paralysis, which of the following toxins is most likely responsible?

A. Botulism (Correct Answer)
B. Tetanus
C. Diphtheria
D. Cholera

Explanation: ***Correct Option: Botulism*** - **Botulinum toxin** blocks the release of **acetylcholine** at the neuromuscular junction, leading to **flaccid paralysis**. - This paralysis typically progresses symmetrically and can affect ocular, bulbar, and peripheral muscles. *Incorrect Option: Tetanus* - **Tetanus toxin** inhibits the release of **inhibitory neurotransmitters** (**GABA** and **glycine**) in the central nervous system. - This leads to uncontrolled muscle contractions, presenting as **spastic paralysis** and **lockjaw**. *Incorrect Option: Diphtheria* - **Diphtheria toxin** causes local inflammation and can lead to systemic effects, including **myocarditis** and **neuropathy**. - The neuropathy can cause weakness, but it is typically a **delayed polyneuropathy** rather than acute flaccid paralysis. *Incorrect Option: Cholera* - **Cholera toxin** activates adenylyl cyclase in intestinal cells, leading to excessive fluid and electrolyte secretion. - The primary symptom is **severe watery diarrhea** and dehydration, not paralysis.

Physiology

2 questions

Golgi tendon organ function is?

Q2Easy

Arrange the steps of spermatogenesis in the sequence of their formation.

INI-CET 2019 - Physiology INI-CET Practice Questions and MCQs

Question 1: Golgi tendon organ function is?

A. Detects the dynamic change in muscle length
B. Detects the muscle stretch
C. Detects the muscle strength
D. Detects the muscle tension (Correct Answer)

Explanation: ***Detects the muscle tension*** - The **Golgi tendon organ (GTO)** is a proprioceptor located at the musculotendinous junction, specifically designed to monitor and respond to changes in **muscle tension** or force. - When muscle tension increases, such as during a strong contraction, the GTO sends inhibitory signals to the motor neurons of the same muscle, leading to muscle relaxation and preventing injury (autogenic inhibition). *Detects the dynamic change in muscle length* - This function is primarily attributed to **muscle spindles**, which are specialized sensory receptors that detect changes in the **length** and rate of change of length of a muscle. - Muscle spindles are responsible for the **stretch reflex**, initiating a contraction when a muscle is stretched too quickly. *Detects the muscle stretch* - While GTOs are involved in reflex responses that can follow muscle stretch, their primary role is not to detect the stretching itself, but rather the **tension** that results from that stretch. - **Muscle spindles** are the primary mechanoreceptors responsible for detecting the stretch of a muscle. *Detects the muscle strength* - "Muscle strength" is a broader term referring to the force a muscle can exert, which is controlled by a combination of neural input and muscle fiber characteristics. - While GTOs contribute to the overall proprioceptive feedback regulating muscle force, they specifically detect **tension** rather than directly measuring "strength" as a global concept.

Question 2: Arrange the steps of spermatogenesis in the sequence of their formation.

A. Spermatogonium > Spermatocyte > Spermatid > Spermatozoa (Correct Answer)
B. Spermatocyte > Spermatogonium > Spermatid > Spermatozoa
C. Spermatogonium > Spermatocyte > Spermatozoa > Spermatid
D. Spermatozoa > Spermatogonium > Spermatocyte > Spermatid

Explanation: ### Explanation **Underlying Medical Concept** Spermatogenesis is the process by which male germ cells develop into mature spermatozoa within the seminiferous tubules. It follows a strictly regulated chronological sequence: 1. **Spermatogonia (2n):** These are the primitive stem cells located on the basement membrane. They undergo mitosis to maintain their population and provide cells for differentiation. 2. **Spermatocytes (2n → n):** Primary spermatocytes undergo **Meiosis I** to form secondary spermatocytes. Secondary spermatocytes then undergo **Meiosis II** to form spermatids. 3. **Spermatids (n):** These are round, haploid cells that result from the completion of meiosis. 4. **Spermatozoa (n):** Through the process of **spermiogenesis** (morphological transformation without further division), spermatids develop tails and lose excess cytoplasm to become mature, motile sperm. **Analysis of Options** * **Option A is correct** as it accurately reflects the progression from stem cell to differentiated gamete. * **Option B is incorrect** because spermatogonia are the precursors to spermatocytes, not the other way around. * **Option C is incorrect** because spermatids must undergo spermiogenesis to become spermatozoa; the spermatozoa are the final product. * **Option D is incorrect** because it reverses the order, placing the mature gamete at the beginning. **High-Yield Facts for NEET-PG** * **Duration:** The entire process of spermatogenesis takes approximately **74 days**. * **Spermiogenesis vs. Spermiation:** *Spermiogenesis* is the transformation of spermatids to spermatozoa. *Spermiation* is the release of mature spermatozoa from Sertoli cells into the tubule lumen. * **Hormonal Control:** LH stimulates **Leydig cells** to produce Testosterone; FSH stimulates **Sertoli cells** to support spermatogenesis. * **Blood-Testis Barrier:** Formed by tight junctions between Sertoli cells, protecting developing germ cells (spermatocytes onwards) from the immune system.