2.Feedback Mechanisms & Homeostasis

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Presentation transcript:

2.Feedback Mechanisms & Homeostasis

Homeostasis All organisms must maintain a constant internal environment to function properly Temperature pH Salinity Fluid levels

Negative Feedback vs Positive Feedback

Feedback Systems Receptor Control center Effector

Negative feedback -Returns the body to equilibrium. -It works like driving car down the road. Constant adjustment to the right or left is required to keep the car on the road.

A negative feedback system is one that tries to keep the body constant A negative feedback system is one that tries to keep the body constant. Exs of Negative Feedback? - Control of body temperature -Control of blood glucose

Negative Feedback Body Temperature Regulation

Negative Feedback Blood Sugar Levels

In a positive feedback system the change will continue to increase in one direction until something happens in the body to stop it.

An example of positive feedback is childbirth

Positive Feedback Oxytocin