Bio103 Mod 1 Terms

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