ANP 1105 Lecture Notes - Lecture 4: Homeostasis, Glycogen, Sweat Gland

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: Joanne Savory

Document Summary

Internal mechanism for keeping the body in normal conditions: controlled by the hypothalamus. A system which variables are regulated so that internal conditions remain stable and relatively constant: examples. Blood ion concentration: not unchanging rather a dynamic state of equilibrium involving many systems. Heart activity/blood pressure monitored and adjusted as needed. 3 essential characteristics of a homeostatic control mechanism. Receptor: senses change (stimulus) and sends out information (afferent pathway) to the. Control centre: determines set point for variable maintenance; analyzes information and determines correct response. Effector: provides means for response (output along efferent pathway) Feedback (negative/positive) allows for regulation within a range/enhanced response. Output reduces or shuts off stimulus: 1 hormone regulating a process: negative feedback decrease secretion, process regulated in opposite directions by 2 different hormones, ex: glycogen. Goal is to prevent the body from having sudden/severe changes. To bring the body back into a normal state. Response of mechanism enhances original stimulus: output further stimulated.