ANP 1105 Lecture Notes - Lecture 4: Walter Bradford Cannon, Cardiac Muscle, Autonomic Nervous System

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

Document Summary

Homeostasis: ability of the body to maintain relatively stable internal conditions even though there is cot=ntinuous change in the outside world- walter cannon. Not unchnaging. is dynamic state of equilibrium involving many systems. Heart activity/ blood pressure monitored and adjusted. Receptor: sense/ respond to changes in the internal/ external environment. Control center: determins set point for variable maintenance; analyzes info and determines correct response. communication between this and receptor by afferent pathway. Effector: provides means for response along effect pathway feedback: negative/ positive allows for regulation within a range. 1 hormone regulating a process: negative feedback recreation. Process regulated in opposite directions by 2 different hormones i. e. blood glucose. Positive feedback: response is in same direction as stimulus and enhances original stimulus. Most disease is seen as disturbance of homeostasis= homeostatic imbalance. Aging associated with progressive decrease in our ability to maintain homeostasis so greater risk for illness.