$$UV_{exposure} \rightarrow \text{Melanin production} \uparrow \rightarrow \text{Vitamin D synthesis} \downarrow$$

Question 1

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

Accepted Answer

Regulation of body temperature

Question 2

A patient presents with a bluish tint to their skin (cyanosis). Which physiological condition is most likely responsible for this appearance?

Accepted Answer

Extremely low oxygen bound to hemoglobin

Question 3

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

Accepted Answer

Stratum lucidum

Question 4

Keratinocytes originate in which layer of the epidermis and migrate upwards over approximately 40-50 days?

Accepted Answer

Stratum basale

Question 5

Which cell type in the epidermis is responsible for producing the pigment that protects DNA from UV radiation?

Accepted Answer

Melanocytes

Question 6

Fingerprints are formed by which anatomical feature?

Accepted Answer

Prominent dermal papillae arranged into dermal ridges

Question 7

Which pigment is responsible for the orange-red coloration in skin and is obtained from the diet?

Accepted Answer

Carotene

Question 8

A person with albinism has a defect in which enzyme, leading to a lack of melanin production?

Accepted Answer

Tyrosinase

Question 9

Which type of sweat gland is most prevalent and is responsible for thermoregulation?

Accepted Answer

Eccrine gland

Question 10

Which accessory structure of the skin is derived from epidermal epithelium and is important for gripping and protection?

Accepted Answer

Hair

Question 11

A third-degree burn is characterized by which of the following?

Accepted Answer

Destruction of epidermis, dermis, and possibly deeper tissues

Question 12

Which skin cancer arises from melanocytes and is most likely to metastasize?

Accepted Answer

Malignant melanoma

Question 13

Which of the following best explains why individuals living near the equator tend to have darker skin?

Accepted Answer

To prevent excess vitamin D production due to high UV exposure

Question 14

Which of the following is TRUE regarding the distribution of melanocytes in human skin?

Accepted Answer

Melanocyte number is virtually identical among all individuals

Question 15

Which skin marking is caused by gaps between collagen bundles in the reticular layer of the dermis?

Accepted Answer

Tension lines

Question 16

Which of the following equations best represents the relationship between UV exposure, melanin, and vitamin D synthesis?

Accepted Answer

$$UV_{exposure} ightarrow 	ext{Melanin production} \uparrow ightarrow 	ext{Vitamin D synthesis} \downarrow$$

Question 17

A patient presents with dark patches on the face during pregnancy. Which condition is most likely?

Accepted Answer

Melasma

Question 18

Which type of gland produces sebum and releases it by holocrine secretion?

Accepted Answer

Sebaceous gland

Question 19

Which cell in the epidermis is associated with sensory neurons and detects light touch and texture?

Accepted Answer

Merkel cell

Question 20

A fungal infection causing both hyperpigmentation and hypopigmentation is most likely:

Accepted Answer

Tinea versicolor

The Integumentary System: Structure, Function, and Clinical Relevance

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