Question 1

Which of the following best describes the structural characteristic that allows epithelium to function as a selective barrier?

Accepted Answer

Tight junctions (zonula occludens) between adjacent cells

Question 2

A patient with a genetic defect in the protein occludin would most likely have problems with which epithelial function?

Accepted Answer

Formation of a tight barrier to prevent paracellular transport

Question 3

Which type of epithelial tissue is best suited for rapid diffusion of gases and is found lining the alveoli of the lungs?

Accepted Answer

Simple squamous epithelium

Question 4

What is the main difference between simple and stratified epithelial tissues?

Accepted Answer

Simple epithelia consist of a single layer of cells, while stratified epithelia have multiple layers

Question 5

Which of the following epithelial specializations increases surface area for absorption in the small intestine?

Accepted Answer

Microvilli

Question 6

A deficiency in the protein connexin 43 (Cx43) would most directly affect which type of cell junction and its function?

Accepted Answer

Gap junctions; intercellular communication

Question 7

Which of the following is TRUE regarding the nutrition of epithelial tissues?

Accepted Answer

Epithelial tissues are avascular and receive nutrients by diffusion from underlying connective tissue

Question 8

Which of the following best describes the function of keratinized stratified squamous epithelium?

Accepted Answer

Protection against abrasion and dehydration on the skin surface

Question 9

Which epithelial cell junction is primarily responsible for preventing the passage of molecules between adjacent cells?

Accepted Answer

Zonula occludens (tight junction)

Question 10

A researcher observes an epithelial tissue with cells of varying heights, all touching the basement membrane, and cilia on the apical surface. Which type of epithelium is this?

Accepted Answer

Pseudostratified ciliated columnar epithelium

Question 11

Which of the following is a correct match between epithelial type and its location/function?

Accepted Answer

Transitional epithelium; lining of urinary bladder for stretch and recoil

Question 12

Which secretion mechanism involves the release of the entire cell along with its contents?

Accepted Answer

Holocrine secretion

Question 13

Which of the following formulas best represents the rate of diffusion of nutrients across the basement membrane, according to Fick's law?

Accepted Answer

$$D = k \frac{A \Delta C}{d}$$

Question 14

Which of the following is a function of the basal lamina in epithelial tissues?

Accepted Answer

Provides structural support and anchors the epithelium to underlying connective tissue

Question 15

A patient with Kartagener’s syndrome has immotile cilia due to a defect in the axonemal dynein protein. Which physiological process is most likely impaired?

Accepted Answer

Movement of mucus in the respiratory tract

Question 16

Which of the following best explains why epithelial cells exhibit polarity?

Accepted Answer

They have different organelles in the apical and basal regions, allowing specialized functions

Question 17

Which of the following is a real-life consequence of a defect in desmosomes (macula adherens) in epithelial tissue?

Accepted Answer

Blistering of the skin due to loss of mechanical strength

Question 18

Which of the following is TRUE about goblet cells?

Accepted Answer

They are unicellular glands that secrete mucus

Question 19

Which of the following best describes the function of gap junctions in cardiac muscle cells after myocardial infarction, as discussed in gene therapy research?

Accepted Answer

They enhance electrical coupling to reduce arrhythmias

Epithelium: Structure, Classification, and Function

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