Q: If a person’s skin renewal rate slows from 20 days to 40 days as they age, what is the percentage increase in renewal time?

$$ \frac{40 - 20}{20} \times 100 = 100\% $$

Question 1

Which layer of the epidermis is responsible for forming epidermal ridges, such as fingerprints, and contains cells like melanocytes and Merkel cells?

Accepted Answer

Stratum germinativum (basal layer)

Question 2

A patient presents with decreased skin elasticity and more visible wrinkles. Which structural change in the dermis most likely explains these symptoms?

Accepted Answer

Breakdown of collagen and elastin fibers

Question 3

Which of the following best describes the function of the subcutaneous (hypodermis) layer?

Accepted Answer

Provides thermal insulation and stabilizes skin position while permitting movement

Question 4

Which type of sweat gland is primarily responsible for reducing body temperature and excreting water and electrolytes onto the skin surface?

Accepted Answer

Eccrine sweat gland

Question 5

A teenager’s skin renews itself approximately every 20 days. If the basal layer produces 1,000 new cells per day, how many new cells are produced during one renewal cycle?

Accepted Answer

$$ 1,000 	imes 20 = 20,000 $$

Question 6

Which of the following structures is NOT considered an accessory structure of the integumentary system?

Accepted Answer

Stratum corneum

Question 7

A patient has a genetic disorder causing hyperkeratosis. Based on the terminology, what does this condition involve?

Accepted Answer

Increased thickness of the skin’s keratin layer

Question 8

Which layer of the dermis contains capillaries and sensory nerve fibers, and is located just beneath the epidermis?

Accepted Answer

Papillary layer

Question 9

Which cell type in the epidermis is primarily responsible for producing the pigment that determines skin tone?

Accepted Answer

Melanocyte

Question 10

If a person’s skin renewal rate slows from 20 days to 40 days as they age, what is the percentage increase in renewal time?

Accepted Answer

$$ \frac{40 - 20}{20} 	imes 100 = 100\% $$

Question 11

Which sensory receptor in the dermis is most sensitive to light touch?

Accepted Answer

Meissner’s corpuscle

Question 12

Which of the following best explains why the skin of the palms and soles is thicker than other areas?

Accepted Answer

Presence of five layers in the epidermis (thick skin)

Question 13

A patient with a burn that destroys the entire epidermis and part of the dermis will lose which of the following functions most directly?

Accepted Answer

Protection against environmental hazards

Question 14

Which gland secretes an oily substance into hair follicles, contributing to lubrication and protection of the skin?

Accepted Answer

Sebaceous gland

Question 15

Which of the following is a function of adipose tissue in the subcutaneous layer?

Accepted Answer

Energy storage and thermal insulation

Question 16

If the papillary layer of the dermis is damaged, which of the following is most likely to be impaired?

Accepted Answer

Supply of nutrients to the epidermis

Question 17

Which of the following best describes the role of the cutaneous plexus?

Accepted Answer

Network of blood vessels and nerves deep to the reticular layer of the dermis

Question 18

Which structure provides nutrients to the hair follicle and is responsible for hair growth?

Accepted Answer

Hair papilla

Question 19

A person sweats profusely during exercise. Which gland is primarily responsible for this response, and what is the main function of this gland?

Accepted Answer

Eccrine sweat gland; regulates body temperature by excreting water and electrolytes

Question 20

Which of the following is TRUE regarding skin cell renewal rates in different age groups?

Accepted Answer

Teenagers renew skin cells in about 20 days, while babies renew in about 14 days

Integumentary System: Structure and Function Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard