CDT Skin Anatomy & Physiology

Question 1

Which layer of the skin is responsible for waterproofing and protection?

Accepted Answer

Epidermis

Answer

The epidermis is the outermost layer of the skin, primarily composed of keratinocytes. These cells produce keratin, a tough, fibrous protein that forms a protective barrier against physical damage, pathogens, and UV radiation. The stratum corneum, the outermost part of the epidermis, is particularly rich in keratin and lipids, providing the essential waterproofing function.

Question 2

What is the primary function of the dermis?

Accepted Answer

Support and nourishment

Answer

The dermis is the thick, middle layer of the skin, located beneath the epidermis. It provides structural support to the skin through its rich network of collagen and elastin fibers, giving skin its strength and elasticity. Additionally, it contains blood vessels that supply nutrients and oxygen to the avascular epidermis, as well as nerves, hair follicles, and glands.

Question 3

Which cells produce melanin?

Accepted Answer

Melanocytes

Answer

Melanocytes are specialized cells found in the basal layer of the epidermis. Their primary function is to produce melanin, a pigment responsible for skin, hair, and eye color. Melanin also plays a crucial role in protecting the skin from harmful ultraviolet (UV) radiation by absorbing it, thereby preventing DNA damage.

Question 4

Which layer contains blood vessels and nerves?

Accepted Answer

Dermis

Answer

The dermis is the middle layer of the skin, located beneath the epidermis. It is rich in connective tissue, blood vessels, nerves, hair follicles, and glands, making it responsible for providing nutrients to the epidermis, regulating temperature, and mediating sensations.

Question 5

What is the role of sebaceous glands?

Accepted Answer

Sebum production

Answer

Sebaceous glands are exocrine glands found in the skin, primarily associated with hair follicles. Their main function is to produce and secrete sebum, an oily substance that lubricates the skin and hair, helping to keep them moisturized and protected.

(CDT) Certified Dermatology Tech Practice Test

(CDT) Certified Dermatology Tech Practice Test

CDT Skin Anatomy & Physiology