Anatomy: Chapter 5 - Epidermis and Sunlight, Hair, Nails, and Glands

Hair, nails, and glands, ACCESSORY STRUCTURES of integumentary system

Vitamin D3

Epidermal cells produce ___________ in the presence of UV radiation

Calcitriol

Liver and Kidneys convert D3 into _________

Calcitriol

Hormone that aids in the absorption of calcium and phosphorus

Rickets

Insufficient D3 can cause _________

Rickets

A softening and weakening of the bones

Basal cell carcinoma, melanoma

Rickets and insufficient D3 can increase the chances of skin cancer. One type, is the less severe, __________, and the more severe, ___________

Hair

Projects above the skin, almost everywhere on the body,

Insulates, particles, touch

Hair helps protect and _______, guards openings against __________, and is sensitive to very light ________

Hair follicles

Hairs are nonliving structures produced in organs called _________

Melanocytes

Color of hair is produced by ________ at hair papilla and determined by genes

Sebaceous Glands

Secrete sebum (oil)

Sebum

Contains lipid, lubricates and protects epidermis, inhibits bacteria.

Simple branched alveolar glands

Associated with hair follicles that discharge directly onto skin

Sweat Glands

Water secretions

Apocrine sweat glands

Located in armpits, around nipples, and groin

Apocrine sweat glands

Secretes into hair focllicles, sticky, cloudy secretions, break down and cause odors,

Merocrine (eccrine) sweat glands

Widely distribute, especially on palms and soles

Merocrine (eccrine) sweat glands

Discharge onto the skin surface, perspirations includes water, salts, electrolytes, and organic compounds, cools the skin and flushed microorganisms

Nails

Protects fingers and toes

Nails

Made of dead cells packed with keratin, metabolic disorders can change this structure

Nail rest

Nail production occurs in a deep epidermal fold near bone called the __________