Question 1

Which layer of the epidermis is primarily responsible for mitotic activity and regeneration of new skin cells?

Accepted Answer

Stratum basale

Question 2

A patient presents with yellowing of the skin and sclera. Which pigment and underlying condition is most likely responsible for this clinical finding?

Accepted Answer

Bilirubin; liver disorder (jaundice)

Question 3

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

Accepted Answer

They synthesize melanin to protect against UV radiation.

Question 4

A burn patient loses the ability to sense light touch in the affected area. Which cell type in the epidermis is most likely damaged?

Accepted Answer

Merkel (tactile) cells

Question 5

Which layer of the dermis is responsible for fingerprints and contains capillary loops and Meissner's corpuscles?

Accepted Answer

Papillary layer

Question 6

A patient with a genetic defect in keratin production would most likely have abnormalities in which layer of the epidermis?

Accepted Answer

Stratum spinosum

Question 7

Which of the following equations best represents the rate of epidermal cell turnover in humans?

Accepted Answer

$$R = \frac{N}{T}$$, where $$R is $$rate, $$N is $$number of cells shed, $$T is $$time$

Question 8

Stretch marks (striae) are most likely to result from which of the following changes in the skin?

Accepted Answer

Tearing of collagen fibers in the reticular layer of the dermis

Question 9

Which of the following is a correct sequence of the layers of the epidermis from deepest to most superficial?

Accepted Answer

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

Question 10

A patient with cyanosis presents with bluish skin coloration. Which of the following best explains the underlying physiological mechanism?

Accepted Answer

Decreased oxygenation of hemoglobin in blood

Question 11

Which of the following structures anchors the skin to underlying muscles and allows for skin mobility?

Accepted Answer

Hypodermis (subcutaneous tissue)

Question 12

Which cell type in the epidermis is most important for immune defense against pathogens?

Accepted Answer

Langerhans (dendritic) cells

Question 13

A patient with albinism lacks pigmentation in the skin, hair, and eyes. Which enzyme is most likely deficient, leading to this condition?

Accepted Answer

Tyrosinase

Question 14

Which of the following best describes the role of the reticular layer of the dermis?

Accepted Answer

Contains dense irregular connective tissue and forms cleavage lines

Question 15

A patient presents with blisters after a burn. Which layer of the skin is most likely affected?

Accepted Answer

Dermis

Question 16

Which of the following is a function of the integumentary system that helps regulate body temperature?

Accepted Answer

Secretion of sweat by eccrine glands

Question 17

Which of the following best explains why the stratum corneum is an effective barrier to water loss?

Accepted Answer

It is composed of dead, keratinized cells tightly packed together.

Question 18

A patient with a mutation in the gene encoding filaggrin would most likely have defects in which layer of the epidermis?

Accepted Answer

Stratum granulosum

Question 19

Which of the following best describes the process of keratinization in the epidermis?

Accepted Answer

Cells fill with keratin, lose their nuclei, and die as they move outward

Study Notes: The Integumentary System (Anatomy & Physiology I)

Study Guide - Practice Questions

Study Guide - Flashcards