Vitamin D3 is synthesized in which region of the skin?

• papillary dermis

• reticular dermis

• epidermis

• hypodermis

What is a function of the papillary dermis?

• provides strength and resiliency to the skin

• protection against micro-organisms

• location of capillaries that nourish the epidermis

• regulation of body temperature

Damage to the epidermis increases the risk of dehydration and infection.

• true

• false

Increased secretions from _____ located throughout the dermis of the body help to lower body temperature.

Tags

NGSS.HS-LS1-3

What is the name of the cells of the epidermis that produce the substance that helps to make the skin water resistant?

What is the name of the cells of the epidermis that produce a pigment that protects the skin against damage from ultraviolet radiation?

Arrector pili muscles are composed of ____ muscle that will ______ when they contract.

• smooth; increase the secretion of sebum

• smooth; cause hair to stand upright

• skeletal; increase the secretion of sebum

• skeletal; cause hair to stand upright

The _____ provides us with insulation from the cold because it contains ______ connective tissue.

• hypodermis; dense regular

• reticular dermis; adipose

• reticular dermis; dense regular

• hypodermis; adipose

Tags

NGSS.HS-LS1-2

Wrinkles are a result of

• overstretching of the dermis.

• sudden loss of adipose tissue

• breakage of collagen fibers in the dermis.

• loss of elastin fibers in the dermis.

The stratum _____ is absent in thin skin.