Integumentary system A+P CH.8 lecture 1

composed of skin, hair, and nails

functions

protects from pathogens

balances fluid levels

stores fatty tissue for energy

produces vitamin D

sensory input

regulates body temperature

skin

largest organ

epidermis, dermis and hypodermis

epidermis

layer we see on outside

Stratum Corneum

no blood vessels or nerve endings

surface cells shed

outermost layer of dead cell

Stratum Basale

where new cells grow

melanocytes

responsible for skin color

located in epidermis

produce melanin

melanin patches on skin form freckles

carotene

skin pigment that gives yellowish tint to skin

albinism

very little pigment in skin, hair and eyes

inherited gene

juandice

yellow skin

body cant break down bilirubin

bronze color

adrenal gland disease

causes skin to produce too much melanin

Ecchymosis

bruised skin

skin, blood or circulatory problems

Dermis

layer below epidermis

contains

capillaries

callogenous/elastic fibers

involuntary muscles

nerve endings

lymph vessels

hair follicles

hair follicles

sudoriferous glands (sweat)

sebaceous glands (oil)

nerve fibers

allow you to sense what is happening in environment

apocrine sweat glands

secrete at hair follicle, groin & anal, and armpits

eccrine glands

palms, feet, forehead and upper lip