Question 1

Which layer of the epidermis is responsible for producing new keratinocytes through cell division?

Accepted Answer

Stratum basale

Question 2

A patient presents with a bluish tint to their skin, especially noticeable on their lips and beneath their nails. What is the most likely physiological cause?

Accepted Answer

Sustained reduction of blood flow and oxygen (cyanosis)

Question 3

Which of the following best describes the function of the papillary layer of the dermis?

Accepted Answer

Contains capillaries, lymphatic vessels, and sensory neurons for nutrient supply and sensation

Question 4

A third-degree burn destroys the epidermis, dermis, and extends into the subcutaneous layer. Why might this type of burn be less painful than a second-degree burn?

Accepted Answer

Because nerve endings are destroyed, reducing sensation

Question 5

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

Accepted Answer

Production of red blood cells

Question 6

A patient with a deficiency in vitamin D production due to lack of sunlight exposure is at risk for which condition?

Accepted Answer

Rickets, characterized by flexible, poorly mineralized bones

Question 7

Which accessory structure of the skin is responsible for producing hairs that provide delicate touch sensations?

Accepted Answer

Hair follicles

Question 8

Which type of sweat gland is most important for thermoregulation and excretion, and is found in highest numbers on the palms and soles?

Accepted Answer

Merocrine (eccrine) sweat glands

Question 9

A surgeon is planning an incision. Why is it clinically significant to make cuts parallel to cleavage (tension) lines in the skin?

Accepted Answer

It allows for better healing and less scarring

Question 10

Which of the following best explains the difference between basal cell carcinoma and malignant melanoma?

Accepted Answer

Basal cell carcinoma originates in the stratum basale and rarely metastasizes, while malignant melanoma arises from melanocytes and is highly metastatic

Question 11

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

Accepted Answer

Stratum lucidum

Question 12

Which of the following equations correctly estimates the percentage of body surface area affected by burns using the 'rule of nines' for an adult?

Accepted Answer

$$Total\;Body\;Surface\;Area\;Burned = (Head\;and\;Neck) + (Each\;Arm) + (Each\;Leg) + (Anterior\;Trunk) + (Posterior\;Trunk)$$

Question 13

Which of the following is a correct sequence of the phases of skin regeneration after injury?

Accepted Answer

Inflammation phase → Migration phase → Proliferation phase → Scarring phase

Question 14

Which of the following best describes the role of calcitriol in the body?

Accepted Answer

Calcitriol allows calcium and phosphate absorption in the small intestine

Question 15

Which structure is responsible for the formation of fingerprints?

Accepted Answer

Dermal papillae and epidermal ridges formed during embryological development

Question 16

A patient with declining numbers of dendritic (Langerhans) cells in the epidermis is most likely to experience which of the following?

Accepted Answer

Increased risk of skin infection and damage

Question 17

Which of the following best describes the secretion mechanism of apocrine sweat glands?

Accepted Answer

Secrete substances by budding off a portion of the membrane and cytoplasm

Question 18

Which of the following is a plausible consequence of reduced blood supply to the skin in elderly individuals?

Accepted Answer

Feeling cold even in a warm room

Question 19

Which of the following best explains why split-thickness skin grafts are preferred over full-thickness grafts in many clinical situations?

Accepted Answer

Split-thickness grafts are less likely to be rejected and heal faster because they include only the epidermis and superficial dermis

Question 20

Which equation best represents the relationship between UV exposure, vitamin D production, and calcium absorption?

Accepted Answer

$$UV\;Exposure \rightarrow Vitamin\;D_3$\;Production \rightarrow Calcitriol \rightarrow Calcium\;Absorption$$

Chapter 5: The Integumentary System – Functional Anatomy of the Skin

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