Chapter 5: Integumentary System Flashcards
Skins two layers
Epidermis
Dermis
Integumentary system
Consist of skin, hair, nails and exocrine glands
Skins function
Protection from external environment
Temperature regulation
Vitamin D production
Tactile sensations
Small amount of excretion and absorption
Dermis
Inner deep layer composed of connective tissue. Contains blood vessels, sweat glands, sebaceous glands, nerve endings, hair follicles.
Hypodermis
The layer beneath the skin. Contains mostly adipose tissue which helps to insulate the body from the outside temperatures. Acts as an energy reservoir. Subcutaneous
Epidermis
Outermost layer, consists of stratified, squamous epithelial tissue. Contains no blood vessels. Avascular.
Stratum basale
Inner most epidermal layer. Stem cells continuously undergo cellular division and push older cells to the surface
Keratinization
Keratin gets added to the cells, making them tough, harder and easier to slough off
Melanocytes
Produce melanin
The more melanin that is produced the darker the skin or hair color
Melanin protects deeper tissues from harmful UV radiation from the sun
Hair
Function
Protective
Found everywhere on the body except palms, soles, lips, nipples and some areas of the genitals
It provides insulation against heat and cold
Hair follicle
Hair portion that has nerve and blood supply
Hair bulb
Part of hair anchored in the dermis layer
Hair papilla
Nourishes each hair
Arrector pili
Muscle that contracts causing hair to “stand on end”
Hair shaft
Visible portion of hair
