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Anatomy - The study of body structure physiology - Study of function Levels of Structural Organization - chemical, cellular, tissue, organ, organ system, organism chemical level - atoms combine to form molecules cellular level - cells are made up of molecules tissue level - tissues consist of similar types of cells organ level - organs made of different types of tissues organ system level - organ system consists of different organs that work together closely organism level - human made of many organ systems integumentary system - skin,hair,nails. protects body as a whole skeletal system - bones and joints. gives body structure Muscular System - muscles and tendons, allows body to move nervous system - nerves, brain, spinal cordendocrine system - glands that secrete hormones cardiovascular system - heart and blood vessels lymphatic system - vessels, ducts, nodes, and organs. Provides defense against infection. Respiratory system - lungs, Brings oxygen into the body and gets rid of carbon dioxide digestive system - breaks down food and eliminates unabsorbed matter urinary system - kidneys, ureters, urinary bladder, urethra, eliminates wastes reproductive system - produces offspring homeostasis - maintenance of a stable internal environment despite external changes how the nervous system maintains homeostasis - sends nerve impulses to the brain How does the endocrine system maintain homeostasis - by releasing hormones negative feedback process - stimulus,receptor, afferent pathway, control center, efferent pathway, effectors, response receptor - temperature sensitive cells in skin and brain Control center (Integration center) - thermoregulatory center in brain Effectors of cooling down - sweat gland