Question 1

Which layer of the skin is primarily responsible for synthesizing vitamin D$$_3$$ when exposed to ultraviolet (UV) radiation?

Accepted Answer

Stratum germinativum

Question 2

A patient presents with a bluish tint to their skin (cyanosis). Which physiological change most likely explains this observation?

Accepted Answer

Severe reduction in blood flow or oxygenation

Question 3

Which of the following best describes the function of dendritic (Langerhans) cells found in the stratum spinosum?

Accepted Answer

They are active in immune response, protecting against pathogens.

Question 4

A burn patient loses large amounts of interstitial fluid through the stratum corneum. What type of perspiration is this?

Accepted Answer

Insensible perspiration

Question 5

Which structure is responsible for the formation of fingerprints?

Accepted Answer

Dermal papillae and epidermal ridges in the stratum germinativum

Question 6

A patient with Addison disease presents with darkening of the skin. What is the underlying cause?

Accepted Answer

Increased secretion of melanocyte-stimulating hormone (MSH) by the pituitary gland

Question 7

Which of the following best explains why thick skin has five layers of keratinocytes while thin skin has only four?

Accepted Answer

Thick skin contains an additional stratum lucidum for extra protection.

Question 8

A person immerses their hands in freshwater for an extended period. What cellular change occurs in the epidermis?

Accepted Answer

Swelling of epithelial cells due to hypotonic solution

Question 9

Which of the following is TRUE regarding the hypodermis (subcutaneous layer)?

Accepted Answer

It stabilizes the skin and allows separate movement.

Question 10

Which gland is responsible for producing a sticky, cloudy secretion that can cause body odor when broken down by bacteria?

Accepted Answer

Apocrine sweat gland

Question 11

A patient with jaundice has a yellowish skin color. What is the physiological basis for this change?

Accepted Answer

Buildup of bile produced by the liver

Question 12

Which of the following best describes the process of keratinization in the epidermis?

Accepted Answer

Formation of a layer of dead, protective cells filled with keratin

Question 13

Which layer of the dermis contains the majority of collagen and elastic fibers, providing strength and elasticity to the skin?

Accepted Answer

Reticular layer

Question 14

A surgical incision is made parallel to the lines of cleavage in the skin. What is the expected outcome?

Accepted Answer

The wound will remain shut and heal well.

Question 15

Which of the following is a function of sebum produced by sebaceous glands?

Accepted Answer

Lubricates and protects the epidermis

Question 16

A patient with vitiligo has patches of depigmented skin. What is the underlying cause?

Accepted Answer

Loss of melanocytes in affected areas

Question 17

Which of the following is TRUE regarding the hair growth cycle?

Accepted Answer

New hair growth begins when the follicle becomes active and produces new hair, shedding the club hair.

Question 18

Which of the following best explains why elderly individuals are more prone to skin infections?

Accepted Answer

Decreased numbers of dendritic (Langerhans) cells

Question 19

Which of the following is a function of the autonomic nervous system in the control of skin glands?

Accepted Answer

It independently controls merocrine sweat glands, allowing localized sweating.

Question 20

A patient is given a hypodermic injection. Into which layer is the medication delivered?

Accepted Answer

Subcutaneous layer (hypodermis)

The Integumentary System: Structure and Function

Study Guide - Practice Questions