Тест: Histology: Tissue Microstructure and Function — 9 въпроса

1. What is the primary focus of histology as a scientific discipline?

A. Analysis of whole organ functions in isolation

B. Study of individual cells' genetic material

C. Study of tissues' microstructure and functions

D. Examination of blood flow and circulation patterns

Answer: (C)

Обяснение

Histology is mainly concerned with the microstructure of tissues and their functions within organs. It provides detailed insights into tissue organization, development, and their roles in health and disease, unlike the other options which focus on broader, different aspects.

2. What is the primary function of microvilli in epithelial cells?

A. Increase absorptive surface area

B. Move mucus across the epithelium

C. Facilitate cell division

D. Generate electrical signals

Answer: (A)

Обяснение

Microvilli are finger-like projections that expand the surface area of epithelial cells to enhance absorption, especially in the intestines and kidney tubules.

3. Which statement accurately describes epithelial tissue?

A. It is primarily responsible for movement and contraction in the body

B. It originates from ectoderm, mesoderm, or endoderm and has tightly packed cells

C. Cells are loosely packed with extensive extracellular matrix

D. It contains a rich network of blood vessels within the tissue

Answer: (B)

Обяснение

Epithelial tissue is characterized by dense, tightly packed cells with minimal extracellular matrix, originating from embryonic layers ectoderm, mesoderm, or endoderm. It functions mainly in protection, secretion, and sensory reception, and does not have blood vessels within the tissue itself.

4. Which type of secretion involves the entire cell disintegrating to release its product?

A. Holocrine

B. Merocrine

C. Apocrine

D. Exocrine

Answer: (A)

Обяснение

Holocrine secretion occurs when the whole secretory cell disintegrates, releasing its content; an example is sebaceous glands.

5. What distinguishes simple epithelium from stratified epithelium?

A. Simple epithelium is always squamous, stratified is always columnar

B. Stratified epithelium is only found in the blood vessels

C. Simple epithelium has multiple cell layers, stratified has one

D. Simple epithelium consists of a single cell layer, stratified has multiple layers

Answer: (D)

Обяснение

Simple epithelium consists of a single cell layer, facilitating functions like absorption and filtration. Stratified epithelium has multiple layers, primarily providing protection, such as in the skin. Their difference is based on the number of layers, not cell shape or location alone.

6. From which germ layers are the epithelium derived?

A. Ectoderm, mesoderm, endoderm

B. Ectoderm and mesoderm only

C. Mesoderm and endoderm only

D. Ectoderm only

Answer: (A)

Обяснение

Epithelial tissues originate from all three germ layers: ectoderm, mesoderm, and endoderm, allowing them to perform diverse functions.

7. What is the main structural difference between endothelium and mesothelium?

A. Endothelium lines blood and lymph vessels, mesothelium lines serous cavities

B. Endothelium is found only in the heart, mesothelium only in the skin

C. Endothelium is glandular, mesothelium is connective tissue

D. They are both types of connective tissue

Answer: (A)

Обяснение

Endothelium lines blood and lymph vessels, whereas mesothelium lines serous cavities like the pleura and peritoneum.

8. Which gland structure is characterized by a sac-like secretory unit?

A. Alveolae

B. Tubulus

C. Acinus

D. Duct

Answer: (A)

Обяснение

Alveolae are small, sac-like secretory units in glands, important for producing secretions with a large surface area.

9. Why does pigmented epithelium in the retina provide protection against light?

A. More pigment absorbs light, reducing exposure of underlying layers

B. Pigment reflects light away from the retina

C. Pigment generates electrical signals

D. Pigment increases light penetration for better vision

Answer: (A)

Обяснение

Pigmented epithelium contains melanin, which absorbs excess light, protecting the retina from damage and reducing light scatter.