Q: Which equation best represents the conversion of cholesterol in the skin to active Vitamin D3 after exposure to UV light?

$$\text{Cholesterol} \xrightarrow{UV} \text{Cholecalciferol} \xrightarrow{Liver} \text{Calcidiol} \xrightarrow{Kidney} \text{Calcitriol}$$

Q: Which equation best represents the percentage of body surface area affected by a burn using the 'rule of nines'?

$$\text{Total Burn Area} = 9\% \times \text{Number of affected extremities}$$

Question 1

Which layer of the skin is primarily responsible for synthesizing keratin and contains cells that are tightly interlocked, no longer divide, and become flatter and thicker as they near the end of their life cycle?

Accepted Answer

Stratum granulosum

Question 2

A patient presents with a blueish tint to their lips and fingertips. Which condition is most likely responsible for this change in skin color?

Accepted Answer

Cyanosis

Question 3

Which of the following structures is found in the papillary dermis and is responsible for discriminative touch?

Accepted Answer

Meissner's corpuscle

Question 4

Which accessory structure of the skin is responsible for producing sebum, a lipid-rich substance that keeps hair healthy?

Accepted Answer

Sebaceous gland

Question 5

A burn that extends completely through the dermis and destroys all origin tissues and cells for healing is classified as:

Accepted Answer

Third degree

Question 6

Which cell type in the stratum basale protects basal cells from UV damage and determines skin tone?

Accepted Answer

Melanocyte

Question 7

Which equation best represents the conversion of cholesterol in the skin to active Vitamin D3 after exposure to UV light?

Accepted Answer

$$	ext{Cholesterol} \xrightarrow{UV} 	ext{Cholecalciferol} \xrightarrow{Liver} 	ext{Calcidiol} \xrightarrow{Kidney} 	ext{Calcitriol}$$

Question 8

Which layer of the skin is avascular and consists mainly of keratinized, stratified squamous epithelium?

Accepted Answer

Epidermis

Question 9

A laceration that heals with less scarring is most likely to be:

Accepted Answer

Parallel to lines of cleavage

Question 10

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

Accepted Answer

Production of red blood cells

Question 11

Which skin disorder is characterized by autoimmune damage to melanocytes, resulting in depigmented patches?

Accepted Answer

Vitiligo

Question 12

Which equation describes the heat loss from the skin by evaporation?

Accepted Answer

$$Q = m \cdot L_v$$

Question 13

Which of the following is true about thick skin compared to thin skin?

Accepted Answer

Thick skin has five layers in the epidermis

Question 14

Which structure is responsible for sensing deep pressure and vibration in the skin?

Accepted Answer

Pacinian corpuscle

Question 15

Which equation best represents the percentage of body surface area affected by a burn using the 'rule of nines'?

Accepted Answer

$$	ext{Total Burn Area} = 9\% 	imes 	ext{Number of affected extremities}$$

Question 16

Which of the following is a function of the hypodermis?

Accepted Answer

Thermal insulation

Question 17

Which cell in the epidermis acts as an immune system cell, capturing pathogens and debris similar to macrophages?

Accepted Answer

Langerhans cell

Question 18

Which skin cancer arises from the stratum basale?

Accepted Answer

Basal cell carcinoma

Question 19

Which equation describes the heat transfer from the skin to the environment by conduction?

Accepted Answer

$$Q = k \cdot A \cdot \Delta T / d$$

Question 20

Which pigment is responsible for the yellowish tint of the skin?

Accepted Answer

Carotene

The Integumentary System: Structure, Function, and Clinical Correlates

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