Integumentary System Cont.

exocrine glands

cutaneous glands divided into:

found all over except in the palms of the hand and soles of the feet. produces product called sebum their ducts empty usually into a hair follicle but some open directly into the skin acne blackheads whiteheads

mixture of oily substances and fragmented cells

active infection of the sebaceous gland

Sweat glands divide into 2

found all over the body the produce sweat

found in axillary and genital areas Secretion contains fatty acids and proteins milky or yellowish

clear secretion of water, some salts, vitamin C, urea traces of metabolic waste and lactic acid.

protects against the entrance of foreign substances protects you from UV radiation exposure and insulates your head to help regulate body temperature s an important sensory organ

hair grows from cells at the base of the ___ (___)

hair ___ contains connective tissue, __ ___ and __

Hair matrix within the papilla is responsible for:

inner layer cells contain soft keratin formed by cells closest to the hair matrix

middle layer cells contain hard keratin formed by cells near the edge of the hair matrix

outer layer cells contain hard keratin formed by cells near the edge of the matrix

coarse hairs, some develop during puberty scalp or eyebrows

fine hairs located over much of the body surface

Hair growth occurs in 3 phases

active phase, new hair production

marks the end of the active phase

resting period for the hair follicle

small piece of smooth muscle causes the formation of “ goosebumps”

composed of packed cells that contain large amounts of hard keratin proteins.