$$ \text{Insensible Water Loss} = \text{Obligatory Loss} + \text{Evaporative Loss} $$

Question 1

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

Accepted Answer

Lymph nodes

Question 2

A patient presents with silvery-white scars on their abdomen after rapid weight gain. What is the most likely cause of these marks?

Accepted Answer

Extreme stretching of the skin causing dermal tears (striae)

Question 3

Which layer of the epidermis is only found in thick skin, such as the palms and soles?

Accepted Answer

Stratum lucidum

Question 4

Keratinocytes are the most abundant cells in the epidermis. What is their primary function?

Accepted Answer

Produce keratin for protection and waterproofing

Question 5

Which pigment is responsible for the yellow to orange coloration of the skin, especially in the palms and soles?

Accepted Answer

Carotene

Question 6

A patient with liver disease presents with yellowing of the skin. Which clinical term best describes this condition?

Accepted Answer

Jaundice

Question 7

Which layer of the dermis is responsible for fingerprints and contains Meissner’s corpuscles?

Accepted Answer

Papillary layer

Question 8

Which type of sweat gland is most numerous and plays a major role in thermoregulation?

Accepted Answer

Eccrine (merocrine) sweat gland

Question 9

Which of the following is a function of the skin’s acid mantle?

Accepted Answer

Inhibits growth of bacteria on the skin surface

Question 10

A patient presents with blue discoloration of the skin and mucous membranes. Which underlying condition is most likely responsible?

Accepted Answer

Decreased oxygenation of hemoglobin (cyanosis)

Question 11

Which of the following best describes the role of dendritic (Langerhans) cells in the epidermis?

Accepted Answer

Function as immune cells to protect against pathogens

Question 12

Which of the following is a physical barrier provided by the skin?

Accepted Answer

Flat, dead, keratinized cells of the stratum corneum

Question 13

Which layer of the epidermis is responsible for cell division and contains melanocytes?

Accepted Answer

Stratum basale

Question 14

A patient suffers a deep cut on the palm. Which dermal layer is most likely affected, and what is a possible consequence?

Accepted Answer

Reticular layer; impaired stretch-recoil properties

Question 15

Which of the following best explains why excessive sun exposure can lead to skin cancer?

Accepted Answer

UV light damages DNA in skin cells, leading to uncontrolled cell growth

Question 16

Which equation best represents the relationship between insensible water loss and body temperature regulation?

Accepted Answer

$$ 	ext{Insensible Water Loss} = 	ext{Obligatory Loss} + 	ext{Evaporative Loss} $$

Question 17

Which of the following is TRUE regarding sebaceous (oil) glands?

Accepted Answer

They secrete sebum into hair follicles and are stimulated by androgens

Question 18

Which of the following is a biological barrier of the skin?

Accepted Answer

Phagocytic cells in the epidermis and dermis

Question 19

A patient presents with black and blue marks after a fall. What is the clinical term for this condition?

Accepted Answer

Bruises (ecchymoses or hematomas)

Question 20

Which of the following best describes the function of cutaneous sensory receptors?

Accepted Answer

They sense painful stimuli and are part of the nervous system

Chapter 5: The Integumentary System – Structure, Function, and Clinical Relevance

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