Question 1

Which of the following best describes the main function of the stratum corneum in the epidermis?

Accepted Answer

It provides a tough, water-resistant barrier by consisting of dead, flattened keratinocytes that are regularly shed.

Question 2

A patient presents with a bluish tint to their skin (cyanosis). Which of the following best explains the physiological cause of this condition?

Accepted Answer

Low levels of oxygen in the blood, resulting in a bluish hue to the skin.

Question 3

Which of the following is NOT a function of the integumentary system?

Accepted Answer

Regulation of blood glucose levels.

Question 4

During thermoregulation, which of the following correctly describes the body's response to an increase in temperature above the normal range?

Accepted Answer

Thermoreceptors detect the change, the hypothalamus activates sweat glands, and blood vessels in the skin dilate to release heat.

Question 5

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

Accepted Answer

Stratum lucidum

Question 6

A person with a genetic mutation that prevents the production of keratin would most likely experience which of the following symptoms?

Accepted Answer

Increased risk of dehydration due to loss of the skin's water barrier.

Question 7

Which of the following best explains why the skin is considered avascular?

Accepted Answer

The epidermis receives nutrients and oxygen by diffusion from blood vessels in the dermis.

Question 8

Which gland is responsible for producing a waxy secretion that helps protect the ear canal?

Accepted Answer

Ceruminous gland

Question 9

A patient with a deficiency in vitamin D synthesis due to lack of sunlight exposure is at risk for which of the following conditions?

Accepted Answer

Decreased calcium absorption leading to weakened bones.

Question 10

Which of the following best describes the role of melanocytes in the skin?

Accepted Answer

They produce melanin, which protects DNA from UV damage.

Question 11

Which of the following is a correct sequence of events in the wound healing process of the skin?

Accepted Answer

Inflammation phase, migratory phase, proliferation phase, scarring phase

Question 12

Which of the following best explains why thick skin does not contain hair follicles?

Accepted Answer

Thick skin is adapted for protection and friction in areas like palms and soles, where hair would interfere with function.

Question 13

A person is exposed to cold temperatures. Which of the following physiological responses would you expect to occur as part of thermoregulation?

Accepted Answer

Constriction of blood vessels in the skin to conserve heat.

Question 14

Which of the following statements about melanin is TRUE?

Accepted Answer

The number of melanocytes is nearly identical among all individuals; differences in skin color are due to the rate of melanin production.

Question 15

Which of the following best describes the function of sebaceous glands?

Accepted Answer

They secrete an oily substance called sebum that inhibits water loss and kills certain bacteria.

Question 16

A patient has a wound that is healing slowly and shows little scarring. Which phase of wound healing is most likely still ongoing?

Accepted Answer

Proliferation phase, where fibroblasts continue to repair the dermis.

Question 17

Which of the following best explains why the skin is able to return to its original shape after being stretched?

Accepted Answer

The presence of elastic fibers in the dermis allows the skin to recoil.

Question 18

Which of the following is the correct formula for calculating the percentage of body weight that is skin, given that skin accounts for 10-15% of total body weight?

Accepted Answer

$$ 	ext{Skin Weight} = 	ext{Total Body Weight} 	imes (0.10 	ext{ to } 0.15) $$

Question 19

Which of the following best describes the function of tactile (Meissner's) corpuscles in the dermis?

Accepted Answer

They are sensory receptors that detect light touch stimuli.

Question 20

A person with a mutation that prevents the formation of the lipid (hydrophobic) coating in the stratum granulosum would most likely experience which of the following?

Accepted Answer

Increased water and electrolyte loss through the skin.

Integumentary System: Structure, Function, and Physiology

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