Question 1

Which layer of the skin is primarily responsible for resisting abrasion, penetration, and water loss, and what is its main structural protein?

Accepted Answer

Stratum corneum; keratin

Question 2

A patient presents with a yellowish tint to their skin and sclera. Which pathological skin color is this, and what is the most likely underlying cause?

Accepted Answer

Jaundice; elevated bilirubin due to compromised liver function

Question 3

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

Accepted Answer

Thick skin is found only in areas subject to friction and requires a smooth surface

Question 4

Which cell type in the epidermis is responsible for immune defense against toxins and microbes, and in which layers are they primarily found?

Accepted Answer

Dendritic cells; stratum spinosum and stratum granulosum

Question 5

A patient has a blister after wearing tight shoes. What is the physiological basis for blister formation?

Accepted Answer

Accumulation of serous fluid between the dermis and epidermis due to damaged dermal blood vessels

Question 6

Which of the following best describes the function of the hypodermis?

Accepted Answer

Serves as an energy reservoir and thermal insulation

Question 7

A forensic scientist is analyzing fingerprints at a crime scene. Which skin marking is responsible for the unique patterns observed, and what is its developmental origin?

Accepted Answer

Friction ridges; formed during fetal development and remain unchanged throughout life

Question 8

Which type of hair is most likely to be found on the scalp of a child before puberty?

Accepted Answer

Vellus hair

Question 9

A patient presents with patchy hair loss and thinning. Which phase of the hair cycle is most likely increased in this patient, and what is the term for this condition?

Accepted Answer

Catagen and telogen; alopecia

Question 10

Which of the following glands is responsible for producing a secretion that waterproofs the ear canal and helps block foreign particles?

Accepted Answer

Ceruminous glands

Question 11

A patient is diagnosed with basal cell carcinoma. Which layer of the epidermis does this cancer originate from, and what is its typical clinical appearance?

Accepted Answer

Stratum basale; small, shiny bump with central depression and beaded edges

Question 12

Which equation best represents the area of skin covering the human body, given the range provided in the study materials?

Accepted Answer

$$1.5 \leq A \leq 2.0\ \mathrm{m}^2$$

Question 13

Which of the following best explains why people with darker skin have more melanin visible throughout the epidermis?

Accepted Answer

Their melanin granules are more spread out and break down more slowly

Question 14

Which sweat gland type is most numerous in the human body and is primarily responsible for thermoregulation?

Accepted Answer

Eccrine (merocrine) sweat glands

Question 15

A patient with a third-degree burn requires immediate medical attention. Which of the following is the most critical initial priority in treatment?

Accepted Answer

Fluid replacement

Question 16

Which equation best describes the percentage of body weight composed by skin, according to the study materials?

Accepted Answer

$$	ext{Skin weight} = 8\% 	imes 	ext{Total body weight}$$

Question 17

Which of the following best explains the evolutionary advantage of darker skin near the equator?

Accepted Answer

Darker skin protects against excess ultraviolet radiation and folate degradation

Question 18

A patient presents with a red, scaly lesion on the scalp that later forms a concave ulcer. Which type of skin cancer is most likely, and from which epidermal cell does it arise?

Accepted Answer

Squamous cell carcinoma; keratinocyte

Question 19

Which of the following best describes the function of the arrector muscle associated with hair follicles?

Accepted Answer

Contracts to make hair stand on end (piloerection)

The Integumentary System: Skin and Subcutaneous Tissue

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