Question 1

Which layer of the epidermis is responsible for the continuous production of new keratinocytes through mitosis?

Accepted Answer

Stratum basale

Question 2

A patient presents with a wound that heals quickly and leaves minimal scarring. The surgeon notes that the incision was made parallel to the skin's cleavage (tension) lines. What property of the dermis explains this observation?

Accepted Answer

Arrangement of collagen fibers in the reticular layer

Question 3

Which cell type in the epidermis functions as a sensory receptor for touch?

Accepted Answer

Tactile (Merkel) cell

Question 4

A person with a genetic defect in the enzyme tyrosinase would most likely have which skin condition?

Accepted Answer

Albinism

Question 5

Which layer of the epidermis is only found in thick skin, such as the palms and soles?

Accepted Answer

Stratum lucidum

Question 6

If a person loses the ability to produce lamellar granules in the stratum granulosum, which physiological function would be most affected?

Accepted Answer

Water retention in the skin

Question 7

Which of the following best describes the role of dendritic (Langerhans) cells in the epidermis?

Accepted Answer

They act as immune system activators by presenting antigens.

Question 8

A patient is exposed to a chemical that disrupts desmosomes in the epidermis. What is the most likely consequence?

Accepted Answer

Loss of mechanical strength and increased skin blistering

Question 9

Which pigment is responsible for the yellow to orange coloration of the skin, especially in the palms and soles, and can be converted to vitamin A?

Accepted Answer

Carotene

Question 10

During a hot summer day, a person produces 12 L of sweat to cool the body. Which physiological process is responsible for this?

Accepted Answer

Sensible perspiration

Question 11

Which of the following substances can penetrate the skin due to its lipid-soluble nature?

Accepted Answer

Nitroglycerin

Question 12

A person with a mutation that prevents the formation of friction ridges would most likely lack which of the following?

Accepted Answer

Unique fingerprint patterns

Question 13

Which gland is responsible for producing a secretion that contains antimicrobial proteins and helps regulate body temperature?

Accepted Answer

Eccrine (merocrine) sweat gland

Question 14

A patient presents with dry, brittle hair and skin that is prone to infection. Which gland is most likely underactive?

Accepted Answer

Sebaceous (oil) gland

Question 15

Which layer of the dermis is responsible for the formation of flexure lines, such as those seen on the palms and fingers?

Accepted Answer

Reticular layer

Question 16

If the skin's acid mantle is disrupted, which of the following is most likely to occur?

Accepted Answer

Increased risk of bacterial infection

Question 17

Which of the following equations best represents the conversion of carotene to vitamin A in the body?

Accepted Answer

$$\mathrm{Carotene} \xrightarrow{Enzymes} \mathrm{Vitamin\ A}$$

Question 18

A person with a deficiency in vitamin D synthesis due to lack of sunlight exposure would most likely have impaired absorption of which mineral in the intestine?

Accepted Answer

Calcium

Question 19

Which of the following best explains why the stratum corneum is an effective barrier against biological, chemical, and physical assaults?

Accepted Answer

It consists of rows of flat, anucleated, keratinized dead cells.

Question 20

A patient with a burn that destroys the stratum basale will most likely experience which consequence?

Accepted Answer

Loss of ability to regenerate new epidermal cells

The Integumentary System: Structure and Function

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