Most control systems of the body are negative feedback. A stimulus causes a reaction that opposes the acting stimulus. i.e1: increased co2 increases pulmonary ventilation. i.e2: decreased arterial pressure activates baroreceptor system, increases heart rate + arterial constriction- acts to maintain homeostasis positive:- stimulus causes a response that promotes the stimulus- tends towards instability, not used as often- ie1: blood clotting, rupture initiates clot formation, enzyme activation within clot causes other enzymes in blood to clot- ie2: uterine contractions in childbirth- ie3: na+ flux in nerve signal propagation- tends to work with larger negative feedback control system (blood clotting cycle within blood volume nfc) adaptive: - complex systems that change their response each time a stimulus is presented until the proper response is determined- ie1: some body movements require rapid responses that cannot wait for signal transmission to the central nervous system and the subsequent response, so sensory nerve signals from the moving parts transmit signals to the brain as to whether the movement was properly completed. If not, the brain sends signals so that the next response is altered. this continues until the proper response is obtained.
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