Download integumentary system

INTEGUMENTARY SYSTEM
INTEGUMENTARY SYSTEM
Includes skin and all accessory organs hair, nails and a variety of glands (sweat
and oil); single largest organ in the body
FUNCTIONS:
1. Protection - most important function;
especially from ultraviolet radiation
2. Regulate body temperature
3. Remove wastes from the body
4. Barrier against infection and injury
INTEGUMENTARY SYSTEM
Skin is composed of two MAIN layers:
1. Epidermis - outermost cells of skin;
undergo rapid cell division (mitosis)
2. Dermis - inner layer of skin;
contains blood vessels, nerve
endings, glands, sense organs,
smooth muscle and hair follicles
3. Hypodermis - below the dermis
(layer of fat and connective tissue);
not a main layer
INTEGUMENTARY SYSTEM
ACCESSORY ORGANS:
1. Hair - produced by cells at base of hair
follicle; used for protection and warmth
2. Nails - grow from nail root located near
tip of fingers and toes; for protection
3. Sweat/Oil Glands - sweat glands regulate body temperature and remove
wastes; oil glands - keeps skin flexible
and waterproof
Picture of Skin
G
F
E
A = Epidermis
B = Dermis
C = Hypodermis
D = Sweat Gland
E = Hair Follicle
F = Sebaceous
(Oil) Gland
G = Hair