Skin - The largest organ in our body
Divided into 2 layers 
Epidermis - epithelial cells
Dermis - connective tissue
Hypodermis
Subcutaneous tissue
Fat storage
Thermoregulation
Blood vessels - Veins and Arteries
Hair follicle
Sebaceous glands
found in all parts of body except palm and feet
Secretes sebum - lubricates our hair, water proofs our skin, defense against pathogens
stimulated by androgen and testosterone harmones
Arrector pilimuscle
contract and pulls hair follicle- goose bumps
Sweat glands - secretes sweat
Eccrine
Apocrine
Palms in hand and soles of feet
Forehead
Axillary and anogenital area - functional post puberty
Nerves
Physiology
Protection
Containment
Heat regulation - sweat, dilation and constriction of blood vessels
Sensation
Synthesis and storage of Vitamin D
Blood reservoir
Excretion of unwanted substance through sweat
Epidermis and Dermis - Cells that make up the skin
Dermis - connective tissue
Basement membrane
connects dermis and epidermis
Stratum basale
cells divide and some new cells move up
receives blood supply from dermis
Stratum spinosum
cells become keratinized
Melanocytes cells
produces Melanin - provides skin color
Denoritic cells
capturing pathogens; protects our body
Stratum granulosum
cells die and flatten
Stratum lucidum
dead and more flattened
Stratum corneum
old cells shed off - flat and super thin
commensal micro organisms
live on skin in unison