Q: Which of the following equations correctly represents the synthesis of melanin from its amino acid precursor?

$$\text{Tyrosine} \xrightarrow{\text{Tyrosinase}} \text{Melanin}$$

Question 1

Which of the following best describes the primary function of melanocytes in the epidermis?

Accepted Answer

They synthesize melanin to protect against UV radiation.

Question 2

A patient presents with a bluish tint to their skin and mucous membranes. Which clinical term best describes this condition, and what is its most likely cause?

Accepted Answer

Cyanosis; decreased oxygenation of the blood

Question 3

Which layer of the epidermis is responsible for the continuous regeneration of skin cells, and what is the main cell type found there?

Accepted Answer

Stratum basale; keratinocyte stem cells

Question 4

A burn patient has blisters and damage extending into the upper dermis. According to burn classification, what degree is this burn and what is the expected healing time with proper care?

Accepted Answer

Second degree; heals in 3-4 weeks

Question 5

Which of the following equations correctly represents the synthesis of melanin from its amino acid precursor?

Accepted Answer

$$	ext{Tyrosine} \xrightarrow{	ext{Tyrosinase}} 	ext{Melanin}$$

Question 6

A person with Addison’s disease may develop a metallic bronze appearance of the skin. Which term best describes this phenomenon?

Accepted Answer

Bronzing

Question 7

Which of the following best explains why the skin is considered an important organ for immunity?

Accepted Answer

It contains Langerhans cells that act as phagocytes.

Question 8

A genetic defect in the CFTR gene leads to which of the following clinical findings in cystic fibrosis patients?

Accepted Answer

Elevated sweat chloride levels

Question 9

Which of the following is a correct statement about the dermis?

Accepted Answer

It contains the papillary and reticular layers, providing strength and elasticity.

Question 10

A patient presents with patchy loss of skin pigmentation. Which condition is most likely responsible, and what is the underlying mechanism?

Accepted Answer

Vitiligo; autoimmune destruction of melanocytes

Question 11

Which of the following best describes the function of eccrine sweat glands?

Accepted Answer

They produce a salty, acidic solution for thermoregulation.

Question 12

A patient with a third-degree burn on the anterior and posterior surfaces of both lower limbs and the anterior trunk would have what percentage of body surface area burned, according to the Rule of Nines?

Accepted Answer

$$54\%$$

Question 13

Which of the following best explains why a third-degree burn is initially painless?

Accepted Answer

Nerve endings in the dermis are destroyed, preventing pain sensation.

Question 14

Which of the following is a function of the arrector pili muscle?

Accepted Answer

Contracts to cause hair to stand upright during cold or fear

Question 15

Which of the following best describes the process by which keratinocytes move from the stratum basale to the stratum corneum?

Accepted Answer

They are pushed upward by mitosis and undergo keratinization, dying as they reach the surface.

Question 16

Which of the following is a correct pairing of gland and secretion function?

Accepted Answer

Ceruminous gland – produces wax to protect the ear canal

Question 17

A patient with a genetic inability to metabolize tyrosine into melanin will most likely present with which condition?

Accepted Answer

Albinism

Question 18

Which of the following best explains why the skin is able to stretch and recoil easily?

Accepted Answer

The presence of collagen and elastic fibers in the dermis

Question 19

Which of the following is the correct order of the epidermal layers from deepest to most superficial in thick skin?

Accepted Answer

Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum

The Integumentary System: Structure, Function, and Clinical Aspects

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