Histology Practice Questions

Q: Which protein is commonly found in the structure of skin and hair?

Keratin. ***Keratin*** - **Keratin** is a fibrous structural protein that forms the main component of **skin**, **hair**, and **nails** [1]. - It provides strength and protective properties to these tissues. *Laminin* - **Laminins** are a family of proteins that are major components of the **basal lamina**, a layer of the extracellular matrix. - They play a crucial role in cell adhesion, migration, and differentiation, but are not the primary structural protein of skin and hair. *Nectin* - **Nectins** are a family of cell adhesion molecules involved in the formation of **adherens junctions** and **tight junctions** between cells. - They are vital for cell-to-cell adhesion in various tissues but are not structural components of skin and hair in the same way as keratin. *Vimentin* - **Vimentin** is an intermediate filament protein found in the **cytoplasm of mesenchymal cells**, such as fibroblasts, endothelial cells, and leukocytes. - It provides mechanical support and helps maintain cell shape but is not a primary structural protein of the outer layer of skin or hair.

Q: Which of the following statements about Langer's lines is false?

Remain constant throughout life time of a person. ***Remain constant throughout life time of a person*** - This statement is **false** because **Langer's lines** are **dynamic**, changing with factors like age, weight fluctuations, and pregnancy. - The orientation of **collagen fibers** in the dermis, which dictates Langer's lines, is influenced by skin tension and underlying tissue changes over time. *Represent lines of natural skin tension* - This statement is **true** because Langer's lines represent the **direction of natural skin tension** created by the predominant orientation of collagen fiber bundles in the dermis. - These lines follow the natural **cleavage lines** of the skin and indicate the direction in which the skin has maximum **extensibility** and **elasticity**. *Correspond to the collagen fibers in dermis* - This statement is **true** because Langer's lines represent the **direction of maximum tension** in the skin, which is determined by the predominant orientation of **collagen fiber bundles** within the dermis. - These lines are an effective mapping of the **structural arrangement** of the skin's connective tissue. *Incision along these lines produces better scar* - This statement is **true** because incisions made **parallel to Langer's lines** experience less tension during healing. - This reduced tension results in **less wound gaping** and subsequent formation of a **finer, less noticeable scar**.

Q: Cell bodies of Müller Cells are present in which layer of the retina?

Inner nuclear layer. ***Inner nuclear layer*** - The **Müller cell** is a type of retinal glial cell that extends across nearly the entire thickness of the retina. - Its **cell body** is located within the inner nuclear layer, positioning it to provide structural and metabolic support to surrounding neurons. *Outer nuclear layer* - This layer primarily contains the **cell bodies of the photoreceptor cells** (rods and cones). - While Müller cell processes extend through this layer, their somas are not located here. *Retinal pigment epithelium* - This is the **outermost layer of the retina**, responsible for nourishing photoreceptors and absorbing scattered light. - It is a distinct cell layer and does not contain the cell bodies of Müller cells. *Ganglion cell layer* - This layer contains the **cell bodies of the ganglion cells**, whose axons form the optic nerve. - Müller cell processes extend through this layer to the inner limiting membrane, but their cell bodies are located in the inner nuclear layer.

Q: Lining epithelium of vocal cord is

Stratified squamous epithelium. Stratified squamous epithelium - The true vocal cords are covered by stratified squamous epithelium to withstand the significant mechanical stress and vibration during phonation. - This type of epithelium provides protection against abrasion and physical forces associated with airflow and vocalization. Simple squamous epithelium - This type of epithelium is typically found in areas where a thin barrier for diffusion and filtration is required, such as the lining of blood vessels (endothelium) or lung alveoli. - It is not suited for areas experiencing significant mechanical stress, like the vocal cords, as it offers limited protection. Ciliated columnar epithelium - Ciliated columnar epithelium is characteristic of the respiratory tract (e.g., trachea, bronchi) where its cilia help to trap and clear foreign particles and mucus. - The true vocal cords do not have ciliated epithelium because cilia would interfere with precise vocal fold vibration and sound production. Non ciliated columnar epithelium - Non-ciliated columnar epithelium is found in regions such as the gastrointestinal tract (e.g., stomach, small intestine) where absorption and secretion are primary functions. - It does not provide the robust protection needed for high-stress areas like the vocal cords, nor does it serve a primary absorptive or secretory role in that location.

Q: Barr body is found in the following phase of the cell cycle:

Interphase. Interphase - A Barr body represents the inactivated X chromosome, which is visible as a condensed chromatin structure [1]. - This condensation and inactivation occur early in development and persist through interphase, making it observable during this non-dividing phase [1]. Metaphase - During metaphase, chromosomes are highly condensed and aligned at the metaphase plate, making individual Barr bodies difficult to distinguish from other condensed chromosomes. - The focus of metaphase is on chromosome alignment for segregation, not on individual inactive X chromosome structures. GI phase - The G1 phase is a part of interphase when the cell grows and prepares for DNA replication. - While the Barr body is present during G1, interphase is a more encompassing term that includes G1, S, and G2 phases, during all of which the Barr body is identifiable. Telophase - In telophase, the nuclear envelope reforms around newly separated chromosomes, and chromosomes begin to decondense. - While the inactive X chromosome is still present, it is less clearly defined as a distinct Barr body compared to the more stable interphase state.

Q: Which is the most abundant type of cartilage in the human body?

Hyaline cartilage. ***Hyaline cartilage*** - **Hyaline cartilage** is the most widely distributed type of cartilage in the human body, found in the **articular surfaces of joints**, nose, trachea, bronchi, laryngeal cartilages, costal cartilages, and most of the embryonic skeleton [1]. - Its **smooth surface** provides low-friction movement and structural support [1]. - It comprises the majority of cartilage mass in the body. *Elastic cartilage* - **Elastic cartilage** is characterized by a high proportion of **elastic fibers**, providing flexibility and elasticity. - It is found in specific locations like the **external ear (pinna)**, epiglottis, and cuneiform cartilages of the larynx. - Least abundant of the three main cartilage types. *Fibrocartilage* - **Fibrocartilage** contains abundant **collagen fibers (Type I)**, making it very strong and resistant to compression and tension. - It is present in structures requiring high tensile strength, such as **intervertebral discs**, menisci of the knee, and the pubic symphysis [2]. *Calcified cartilage* - **Calcified cartilage** is not a separate type but represents **hyaline cartilage undergoing calcification** during endochondral ossification [1], [2]. - It is a transitional form found at the junction between cartilage and bone in growing bones [3].

Q: Herring's bodies are present in which part of the pituitary gland?

Neurohypophysis. ***Neurohypophysis*** - **Herring bodies** are terminal enlargements of unmyelinated axons within the posterior pituitary (neurohypophysis) that store and then release neurohormones like **oxytocin** and **ADH** [1]. - These structures represent accumulations of **neurosecretory vesicles** containing hormones, neurophysins, and ATP, which are synthesized in the hypothalamus and transported to the neurohypophysis [2]. *Pars tuberalis* - The pars tuberalis is a part of the **adenohypophysis (anterior pituitary)** that wraps around the infundibular stalk but does not contain Herring bodies. - Its primary function is not typically associated with the storage and release of neurohormones in the same manner as the neurohypophysis. *Pars intermedia* - The pars intermedia is a small, rudimentary part of the **adenohypophysis** located between the anterior and posterior lobes [1], primarily involved in producing **melanocyte-stimulating hormone (MSH)**. - It does not contain Herring bodies, which are exclusive to the neurosecretory terminals of the posterior pituitary. *Pars terminalis* - "Pars terminalis" is not a recognized anatomical division of the pituitary gland. - The primary divisions are the **adenohypophysis (anterior pituitary)**, which includes pars distalis, pars tuberalis, and pars intermedia, and the **neurohypophysis (posterior pituitary)**.

Q: Which muscle has the highest proportion of Type II (fast-twitch) muscle fibers?

Calf muscles. Type II fibers generate force quickly and are essential for activities requiring speed and power [1]. The gastrocnemius is designed for powerful, rapid contractions needed for jumping, sprinting, and explosive movements, while postural muscles like the erector spinae are predominantly Type I (slow-twitch) fibers designed for endurance [1].

Q: Gland of Moll opens in/on the ?

Hair follicle. ***Hair follicle*** - The **glands of Moll** (also known as ciliary glands) are modified **apocrine sweat glands** located at the margin of the eyelid [1]. - Their ducts typically open into the **follicles of the eyelashes** or directly onto the eyelid margin between the lashes [1]. *Skin* - While they are a type of **sweat gland**, their opening is specifically associated with **eyelid structures**, not general skin surface. - The skin surface generally has eccrine sweat glands opening directly to it. *Tarsal plate* - The **tarsal plate** is a dense connective tissue layer within the eyelid that provides structure [1]. - The glands of Moll are located anterior to the tarsal plate, not opening into it. *Ducts of Meibomian glands* - **Meibomian glands** (tarsal glands) are sebaceous glands located within the tarsal plate, secreting an oily layer for the tear film. - Their ducts open onto the eyelid margin through orifices that are distinct from those of the glands of Moll.

Q: Type of collagen present in the cornea?

Type I. ***Type I*** - **Type I collagen** is the most abundant type of collagen in the body, found in connective tissues such as **bone**, **skin**, **tendons**, and the **cornea**. [2] - Its high tensile strength and organized fibril structure contribute to the cornea's **transparency** and mechanical stability. [1] *Type II* - **Type II collagen** is primarily found in **hyaline cartilage**, where it forms a mesh-like network that provides resistance to compression. [2] - It is crucial for the structural integrity of joints and is not a major component of the cornea. *Type III* - **Type III collagen** is found in **reticular fibers** and is prominent in **extensible connective tissues** such as skin, blood vessels, and internal organs. - While present in some ocular structures, it is not the dominant collagen type in the cornea. *Type IV* - **Type IV collagen** is a major component of **basement membranes**, where it forms a sheet-like network rather than fibrils. - It provides structural support and filtration properties to tissues like the glomerulus and is found in the corneal basement membrane, but not as the primary structural collagen of the corneal stroma.

Question 1

Which protein is commonly found in the structure of skin and hair?

Accepted Answer

Keratin

Answer

Laminin

Answer

Nectin

Answer

Vimentin

Question 2

Which of the following statements about Langer's lines is false?

Accepted Answer

Remain constant throughout life time of a person

Answer

Represent lines of natural skin tension

Answer

Correspond to the collagen fibers in dermis

Answer

Incision along these lines produces better scar

Question 3

Cell bodies of Müller Cells are present in which layer of the retina?

Accepted Answer

Inner nuclear layer

Answer

Outer nuclear layer

Answer

Retinal pigment epithelium

Answer

Ganglion cell layer

Question 4

Lining epithelium of vocal cord is

Accepted Answer

Stratified squamous epithelium

Answer

Ciliated columnar epithelium

Answer

Non ciliated columnar epithelium

Answer

Simple squamous epithelium

Question 5

Barr body is found in the following phase of the cell cycle:

Accepted Answer

Interphase

Answer

Metaphase

Answer

Telophase

Answer

G1 phase

Question 6

Which is the most abundant type of cartilage in the human body?

Accepted Answer

Hyaline cartilage

Answer

Calcified cartilage

Answer

Elastic cartilage

Answer

Fibrocartilage

Question 7

Herring's bodies are present in which part of the pituitary gland?

Accepted Answer

Neurohypophysis

Answer

Pars tuberalis

Answer

Pars intermedia

Answer

Pars terminalis

Question 8

Which muscle has the highest proportion of Type II (fast-twitch) muscle fibers?

Accepted Answer

Calf muscles

Answer

Back muscles

Answer

Gluteal muscles

Answer

Hand muscles

Question 9

Gland of Moll opens in/on the ?

Accepted Answer

Hair follicle

Answer

Skin

Answer

Tarsal plate

Answer

Ducts of Meibomian glands

Question 10

Type of collagen present in the cornea?

Accepted Answer

Type I

Answer

Type II

Answer

Type III

Answer

Type IV

Histology — MCQs

Histology — MCQs

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