Understand The Concepts Of Negative And Positive Feedback

Question 1

Describe the characteristics of a control system

Answer 1

1. Stimulus
2. Receptors - detect stimuli
   Communication between afferent pathway:
   - nervous system (action potential)
   - endocrine system (hormones)
3. Control centre (hypothalamus)
   Communication between efferent pathway
4. Effectors - causes change e.g sweat glands, muscle and kidney

Question 2

What is negative feedback?

Answer 2

-response in a way to reverse the direction of change
- most common form of feedback in physiological systems

Question 3

What is positive feedback?

Answer 3

Response in a way so as to change the variable even more in the direction of the change.
Used when rapid change is desirable
Example:
Blood clotting or ovulation