Histology Practice Questions

Q: Type of collagen found in space of Disse in liver is -

Collagen III & IV. ***Collagen III & IV*** - The **space of Disse** in the liver contains a delicate extracellular matrix predominantly composed of **collagen type III (reticular fibers)**, which provides structural support, and **collagen type IV**, a major component of basement membranes. - This specific collagen composition is crucial for regulating the exchange of solutes between **sinusoidal blood** and **hepatocytes**, as well as for the functional integrity of the liver [1]. *Collagen I & II* - **Collagen type I** is the most abundant collagen in the human body, found in connective tissues like **bone, skin, tendons, and ligaments**, but is not primary in the space of Disse. - **Collagen type II** is characteristic of **hyaline cartilage** and vitreous humor, and is not a significant component of the liver's extracellular matrix in the space of Disse. *Collagen II* - As mentioned, **collagen type II** is primarily found in **cartilage** and vitreous humor, which are distinct from the architectural requirements of the liver sinusoidal space. - Its presence in the space of Disse would not provide the necessary structural flexibility and support for the metabolic functions of the liver. *Collagen II & V* - While **collagen type V** is a minor fibrillar collagen that associates with collagen type I in many tissues, it is not a primary component of the space of Disse. - **Collagen type II** is, again, largely confined to cartilaginous structures, making this an unlikely combination for the liver microenvironment.

Q: Which type of collagen is primarily responsible for forming the basement membrane sheets?

Type IV. ***Type IV*** - **Type IV collagen** is unique as it forms a **two-dimensional network** that constitutes the structural foundation of **basement membranes**. - Its structure, with **non-fibrillar domains**, allows for assembly into sheets rather than fibrils, providing essential support and filtration properties. *Type I* - **Type I collagen** is the most abundant type in the human body, providing **tensile strength** to tissues like **skin, bone, tendons**, and ligaments. - It forms **thick, striated fibrils** and does not primarily associate with basement membranes [1]. *Type II* - **Type II collagen** is the main collagen found in **cartilage**, providing **resilience and shock absorption**. - It forms thin fibrils within the cartilage matrix and is not a component of basement membranes. *Type VI* - **Type VI collagen** is a minor fibrillar collagen that associates with **interstitial connective tissues**, often forming a **microfibrillar network**. - It links cells to the surrounding matrix and is not a primary component of basement membrane sheets.

Q: What is the approximate ratio of connective tissue to smooth muscle in the cervix?

Approximately 8:1. ***Approximately 8:1*** - The **cervix** is predominantly composed of **fibrous connective tissue**, which provides its structural integrity and rigidity [1]. - This high ratio of **collagenous connective tissue** to smooth muscle is crucial for maintaining pregnancy and undergoing significant remodeling during parturition [1]. - The approximate ratio is **8:1 to 10:1**, with connective tissue forming about 85-90% of cervical tissue [1]. *2:1* - This ratio would imply a significantly higher proportion of **smooth muscle** (33%), making the cervix much more muscular and less fibrous than it actually is. - Such a composition would compromise the cervical function of maintaining a **closed uterine orifice** during pregnancy. *5:1* - While higher than 2:1, this ratio still underestimates the true dominance of **connective tissue** in the cervical structure. - The **cervix's mechanical properties**, including its ability to resist stretching, are primarily due to its abundant collagen content. *15:1* - This ratio overestimates the proportion of connective tissue, suggesting less than 7% smooth muscle. - While the cervix is indeed fibrous, it does contain a modest amount of **smooth muscle** (10-15%) particularly in the internal os region, making this ratio too extreme [1].

Q: What is the approximate number of cones in the human retina?

Approximately 3-5 million cones. Approximately 3-5 million cones - The human retina contains roughly **4.5 million cones**, concentrated in the **fovea**, which is responsible for **high-acuity vision** and color perception [1]. - Cones are light-sensitive cells that detect **fine details** and are essential for vision in **bright light conditions** [1]. *Approximately 10-20 million cones* - This range is significantly higher than the actual number of cones found in the human retina. - While there are millions of photoreceptors, the *majority are rods*, not cones [1]. *Approximately 25-50 million cones* - This figure vastly *overestimates* the number of cones in the human eye. - The total number of photoreceptor cells (rods and cones combined) in the retina typically ranges from **100-125 million** [1]. *Approximately 50-100 million cones* - This range is incorrect as it refers more closely to the *total number of rods* in the human retina, which is about **90-120 million** [1]. - Cones constitute a much smaller proportion of the total photoreceptor population [1].

Q: Identify the type of connective tissue present in the image.

Dense irregular. ***Dense irregular*** - The image shows **densely packed collagen fibers** arranged in an **irregular, haphazard fashion**, characteristic of dense irregular connective tissue. - This type of tissue provides **strength** and resistance to stress from multiple directions, found in the **dermis of the skin** and organ capsules. *Loose and irregular* - **Loose connective tissue** would show more ground substance and fewer, loosely arranged fibers, whereas this image displays high fiber density. - While it is "irregular" in fiber arrangement, the density of fibers rules out the "loose" classification. *Specialized* - **Specialized connective tissues** include cartilage, bone, blood, and adipose tissue, which have distinct cellular and extracellular matrix components not seen here. - This tissue lacks the specific cellular and matrix characteristics that would classify it as specialized (e.g., chondrocytes in lacunae, osteocytes, blood cells). *Dense regular* - **Dense regular connective tissue** features collagen fibers arranged in parallel bundles, providing strength in one direction. - Examples include **tendons and ligaments**, which are structurally organized in an orderly, aligned manner, unlike the displayed irregular arrangement.

Q: Which of the following statements about cardiac muscle is true?

Cardiac muscle cells have centrally located nuclei.. ***Cardiac muscle cells have centrally located nuclei.*** - Unlike **skeletal muscle** cells which have multiple, peripherally located nuclei, cardiac muscle cells typically have one or two **centrally located nuclei**. - This is a key distinguishing histological feature when observing cardiac muscle tissue under a microscope. *Cardiac muscle fibers are arranged in sheets.* - While cardiac muscle forms the walls of the heart, its individual fibers (cells) are **branched** and interconnected, not typically described as being arranged in discrete sheets. - The arrangement allows for a **syncytium-like functionality**, enabling coordinated contraction. *Cardiac muscle fibers are spindle-shaped.* - **Spindle-shaped cells** with a single central nucleus are characteristic of **smooth muscle**, not cardiac muscle. - Cardiac muscle cells are branched and generally cylindrical with blunt ends. *Cardiac muscle lacks gap junctions.* - Cardiac muscle cells are abundant in **gap junctions**, which are critical for electrical coupling and synchronous contraction. - These gap junctions are located within **intercalated discs** and allow for rapid propagation of action potentials between cells.

Q: Billroth's cords are present in which part of the spleen?

Red pulp. ***Red pulp*** - **Billroth's cords**, also known as **splenic cords**, are a prominent histological feature found exclusively within the **red pulp** of the spleen [1]. - They are composed of a meshwork of reticular cells and fibers, with large numbers of **macrophages**, red blood cells, and other leukocytes, which are critical for **blood filtration** and old red blood cell destruction [1]. *White pulp* - The white pulp is primarily composed of lymphoid tissue, including **lymphocytes** clustered around central arteries, forming the periarteriolar lymphoid sheaths (PALS) and lymphoid nodules (follicles). - Its main function is immunological, involving **lymphocyte proliferation** and immune responses, rather than blood filtration via Billroth's cords [1]. *Both* - This option is incorrect because Billroth's cords are specifically located in the red pulp and are not a feature of the white pulp. - The architectural and functional roles of the white and red pulp are distinct, with specialized structures allocated to each region. *Capsule* - The **capsule** is the outermost connective tissue layer that encloses and protects the entire spleen. - It contains smooth muscle cells and fibroblasts but does not house the splenic parenchyma, including Billroth's cords.

Q: Pituicytes are seen in ?

Posterior lobe. ***Posterior lobe*** - **Pituicytes** are specialized glial cells found exclusively in the **posterior pituitary** (neurohypophysis). [1] - They provide structural support and regulation for the nerve terminals that release **antidiuretic hormone (ADH)** and **oxytocin**. [1] *Anterior lobe* - The anterior pituitary, or **adenohypophysis**, consists of glandular epithelial cells that synthesize and secrete various hormones. [2] - It does not contain pituicytes, which are glial cells. [2] *Intermediate lobe* - The intermediate lobe is a rudimentary part of the pituitary gland in humans, primarily producing **melanocyte-stimulating hormone (MSH)**. [1] - While it is part of the pituitary, it does not contain pituicytes. *All of the options* - Pituicytes are specific to the posterior pituitary, so they are not found in all parts of the gland. - Different lobes of the pituitary gland have distinct cellular compositions and functions.

Q: Which of the following hormones is secreted by acidophils in the anterior pituitary gland?

GH. ***GH*** - **Growth Hormone (GH)** is secreted by **somatotrophs**, which are a type of acidophil cell in the anterior pituitary. - GH plays a crucial role in **growth**, **metabolism**, and cell reproduction. - **Note**: Prolactin is also secreted by acidophils (lactotrophs), but among the given options, only GH is an acidophil hormone. *TSH* - **Thyroid-stimulating hormone (TSH)** is secreted by **thyrotrophs**, which are **basophil** cells in the anterior pituitary. - TSH stimulates the **thyroid gland** to produce thyroid hormones. *ACTH* - **Adrenocorticotropic hormone (ACTH)** is secreted by **corticotrophs**, which are another type of **basophil** cell. - ACTH stimulates the **adrenal cortex** to secrete glucocorticoids. *FSH* - **Follicle-stimulating hormone (FSH)** is secreted by **gonadotrophs**, which are also **basophil** cells. - FSH is involved in the **development of follicles** in the ovaries and **spermatogenesis** in the testes.

Q: All the following features are seen in neurons from dorsal root ganglia, EXCEPT:

They are multipolar. ***They are multipolar*** - Dorsal root ganglia (DRG) neurons are typically **pseudounipolar**, meaning they have a single process that branches into two (peripheral and central) rather than multiple dendrites and an axon [1]. - **Multipolar neurons** are characteristic of motor neurons and interneurons in the central nervous system, not DRG sensory neurons [1]. *They contain lipofuscin granules* - **Lipofuscin granules** are common in long-lived, post-mitotic cells like neurons and are considered "wear and tear" pigments, accumulating with age. - Their presence in DRG neurons is a normal finding and reflects the neuron's metabolic activity over time. *They have eccentrically located nuclei* - While not universally present in all DRG neurons, an **eccentrically located nucleus** is a common histological feature of certain types of DRG neurons, particularly larger ones. - This feature helps distinguish them from other neuron types and can be accentuated by the large amount of cytoplasm in these cells. *They are derived from neural crest cells* - All sensory neurons of the DRG, along with other components like Schwann cells and sympathetic ganglia, originate from **neural crest cells**. - This developmental origin is a fundamental characteristic of DRG neurons, distinguishing them from CNS neurons derived from the neural tube.

Question 1

Type of collagen found in space of Disse in liver is -

Accepted Answer

Collagen III & IV

Answer

Collagen I & II

Answer

Collagen II

Answer

Collagen II & V

Question 2

Which type of collagen is primarily responsible for forming the basement membrane sheets?

Accepted Answer

Type IV

Answer

Type I

Answer

Type II

Answer

Type VI

Question 3

What is the approximate ratio of connective tissue to smooth muscle in the cervix?

Accepted Answer

Approximately 8:1

Answer

2:1

Answer

5:1

Answer

15:1

Question 4

What is the approximate number of cones in the human retina?

Accepted Answer

Approximately 3-5 million cones

Answer

Approximately 25-50 million cones

Answer

Approximately 50-100 million cones

Answer

Approximately 10-20 million cones

Question 5

Identify the type of connective tissue present in the image.

Accepted Answer

Dense irregular

Answer

Loose and irregular

Answer

Specialized

Answer

Dense regular

Question 6

Which of the following statements about cardiac muscle is true?

Accepted Answer

Cardiac muscle cells have centrally located nuclei.

Answer

Cardiac muscle fibers are arranged in sheets.

Answer

Cardiac muscle fibers are spindle-shaped.

Answer

Cardiac muscle lacks gap junctions.

Question 7

Billroth's cords are present in which part of the spleen?

Accepted Answer

Red pulp

Answer

White pulp

Answer

Both

Answer

Capsule

Question 8

Pituicytes are seen in ?

Accepted Answer

Posterior lobe

Answer

Anterior lobe

Answer

Intermediate lobe

Answer

All of the options

Question 9

Which of the following hormones is secreted by acidophils in the anterior pituitary gland?

Accepted Answer

GH

Answer

TSH

Answer

ACTH

Answer

FSH

Question 10

All the following features are seen in neurons from dorsal root ganglia, EXCEPT:

Accepted Answer

They are multipolar

Answer

They are derived from neural crest cells

Answer

They have eccentrically located nuclei

Answer

They contain lipofuscin granules

Histology — MCQs

Histology — MCQs

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