Introduction to feedback mechanisms presentation .pptx

OFFICI AL HOMEOSTASIS e tendency towards a relatively stable equilibrium between interdependent elem especially as maintained by physiological processes OFFICI AL OBJECTIVES By the end of this session, students will be able to: -Understand what a feedback mechanism is -Understand the elements involv...

OFFICI AL HOMEOSTASIS e tendency towards a relatively stable equilibrium between interdependent elem especially as maintained by physiological processes OFFICI AL OBJECTIVES By the end of this session, students will be able to: -Understand what a feedback mechanism is -Understand the elements involved within a feedback mechanism -Have an understanding how feedback mechanisms relate to homeostasis OFFICI AL FEEDBACK MECHANISM A feedback mechanism is a loop system wherein the system responds to a CHANGE. The response may be in the same direction (as in POSITIVE feedback) or in the opposite direction (as in NEGATIVE feedback) OFFICI AL POSITIVE VS. NEGATIVE FEEDBACK The key difference between positive and negative feedback is their response to change: Positive feedback amplifies change while negative feedback reduces change. This means that positive feedback will result in more of a product: more apples, more contractions, or more clotting platelets. Negative feedback will result in less of a product: less heat, less pressure, or less salt. Positive feedback moves away from a target point while negative feedback moves towards a target. OFFICI AL A SIMPLE EXAMPLE.. = How does the body react to the drop in temperature? OFFICI AL OFFICI AL ELEMENTS OF A FEEDBACK LOOP -Homeostasis -Stimulus -Receptor -Control Centre -Effector -Homeostasis OFFICI AL OFFICI AL OFFICI AL NEGATIVE FEEDBACK LOOP OFFICI AL NEGATIVE FEEDBACK LOOP POSITIVE FEEDBACK LOOP OFFICI AL OFFICI AL POSITIVE FEEDBACK LOOP OFFICI AL OBJECTIVES By the end of this session, students will be able to: -Understand what a feedback mechanism is -Understand the elements involved within a feedback mechanism -Have an understanding how feedback mechanisms relate to homeostasis OFFICI AL QUESTIONS??? OFFICI AL OFFICI AL OFFICI AL OFFICI AL OFFICI AL OFFICI AL OFFICI AL