Introduction• Two or more kinds of tissues grouped togetherand performing specialized functions constitutesan organ.• The skin and its various structures make up theintegumentary system. 2
Skin and Its Tissues• Composed of several tissue types• Maintains homeostasis• Protective covering• Retards water loss• Regulates body temperature• Houses sensory receptors• Contains immune system cells• Synthesizes chemicals (such as vit D)• Excretes small amounts of wastes 3
Heat Production and Loss• Heat is a product of cellular metabolism • The most active body cells are the heat producers and include: • Skeletal muscle • Cardiac muscle • Cells of certain glands such as the liver• The primary means of heat loss is radiation • Also there is conduction, convection and evaporation 18
Problems in Temperature Regulation• Hyperthermia – abnormally high body temperature• Hypothermia – abnormally low body temperature 19
Healing of Wounds and Burns• Inflammation is a normal response to injury or stress.• Blood vessels in affected tissues dilate and becomemore permeable, allowing fluids to leak into thedamaged tissues.• Inflammed skin may become: • Reddened • Swollen • Warm • Painful 20
Lifespan Changes• Skin becomes scaly • Melanin production slows• Age spots appear • Hair thins• Epidermis thins • Number of hair follicles• Dermis becomes decreasesreduced • Nail growth becomes• Loss of fat impaired• Wrinkling • Sensory receptors decline• Sagging • Body temperature unable to• Sebaceous glands be controlledsecrete less oil • Diminished ability to activate Vitamin D 24
Gostou de algum slide específico?
Recortar slides é uma maneira fácil de colecionar informações para acessar mais tarde.