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Chemical level Atoms combined to form molecules cellular level cells (smallest known life forms) made up of molecules tissue level tissues are groups of cells organ level Organs are made up of different types of tissues (two or more) organ system level consist of different organs that work together closely to create the organismal level organismal level an organism is a living individual; all the parts of the human body functioning together constitue the total organism integumentary system the organ system that forms a protective covering on the outside of the body, skin endocrine system Controls metabolic activities of the body lymphatic system lymph fluid, lymoh vessels, lymph nodes, spleen, tonsils, thymus gland respiratory system Takes in oxygen and eliminates carbon dioxide excretion the process by which wastes are removed from the body recepter A structure that monitors the body's internal functions and conditions; detects changes in the body's internal environment control center analyzes the information recieved from the receptor and decides upon the best course of action positive feedback mechanisms rare in the body; usually increase the original stimulus and push the variable farther from the original value homeostatic imbalance Beyond normal range - most diseases (organs = less efficient & capable of maintaining stability) intermediate between medial and lateral antecubital forearm axillary armpit buccal cheek coxal hip crural leg femoral Thigh inguinal area where thigh meets body trunk; groin tarsal ankle region cephalic head deltiod Shoulder occipital posterior surface of head popliteal posterior knee area sacral between hips scapular shoulder blade sural the posterior surface of lower leg; the calf