ANP 1105 Chapter Notes - Chapter 3: Extracellular Fluid, Ejaculation, Bronchiole

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: Jackie Carnegie

Document Summary

Variable: factor or event being regulated (e. g. body temperature, blood sugar) Negative feedback mechanisms: mechanisms cause variable to change in opposite direction; shuts/reduces original effect of stimulus. Goal: prevent sudden severe change in body, maintain around set point by: (1) 1 hormone/neural pathway regulating a process via secretion. E. g. heart rate, blood pressure, rate of breathing (2) process regulated in opposite directions by 2 different hormones/neural pathways. Control of blood sugar: mechanism response enhances stimulus=output further stimulated. Positive=change in same direction as original response; goal attained. Set off series of events; self-perpetuating (called cascades) Blood clotting: maintains homeostasis as disturbance is sealed preventing further disruption. Aging: progressive decrease in ability to maintain homeostasis (greater risk for illness); e. g type 2 diabetes: nfm overwhelmed, pfm take over. Ans (involuntary)=system of motor neurons to smooth & cardiac muscle & glands to allow responses usually without our awareness (monitors stability of internal environment)