a2 bio f214

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  • Created by: Samantha
  • Created on: 30-09-10 19:13

Communication CHAPTER 1:

Principles of Homeostasis:

Negative Feedback - requires a receptor and effector. Receptor monitors the factor being controlled. if value of the factor is not within suitable range the receptor communicates with the effector. The effector then causes an action that brings factor back to normal.
Positive Feedback - mechanism that carries on increasing body temperature

Change in Temperature:

Fever - chemical pyrogens release white blood cells, raise set point causing body temp to increase by 2-3C
Hibernation - some mammals release hormones that reduce set point to


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