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anatomy
study of structure of the human body
physiology
study of body functions
metabolism
total of all chemical functions in an organism
anabolism
build large molecules
catabolism
break down large molecules
responsiveness
quick and brief responses to stimuli
ecternal respiration
diffusion of oxygen and carbon dioxide between air in the lungs and the pulmonary capillaries
internal respiration
diffusion of oxygen and carbon dioxide between blood and cells
cellular respiration
uses oxygen to make ATP; products are water and carbon dioxide
excretion
removing waste from the body
homeostasis
maintenance of consistent internal environment in response to external conditions
negative feedback
controls most body processes, fluctuates around set point, results in opposite direction of stimulus
(think sweating)
positive feedback
occurs less frequently, stimulus is reinforced in one direction until climactic event that signals the body to return to homeostasis
reproduction
primary role of human species; unique organ system
