Consists of two layers of the epidermis and dermis.
Skin: a thin outer layer dead contain protein horny skin called keratin gain strength and make it impermeable to water or micro-organisms.
Inner layer (layer generated) living cells function / compensate damaged surface cells.
Dermis is made up of muscle tissue and nervous and sweat glands and sebaceous glands.
Defensive function of the skin: prevents the arrival of any reasoned disease to blood only when an injury occurs, but quickly thickens cells underneath with blood components to work on healing.
