Negative Vs Positive Feedback Mechanisms - Edubirdie

University:
Western Sydney University
Course:
MEDI 2003 | Clinical Sciences 2
Academic year:

2024
Views:

186

Pages:

2
Author:

Mariam A. A.

NEGATIVE VS POSITIVE FEEDBACK MECHANISMS Negative Feedback Components ✓ Homeostasis can be explained using a stimulus-response model in which a change in the external or internal environmental conditions is detected and appropriate responses occur. ✓ These responses occur via a negative feedback mechanism, which involves: a stimulus, which is a change in the environment a receptor that detects the change in the environment a control centre that controls the response - an effector that receives the message and carries out the response - a response that mitigates the original stimulus, hence the negative feedback. Note: • • afferent pathway: carries nerve impulses to the control centre efferent pathway: carries nerve impulses away from the control centre Positive feedback mechanism In a positive feedback mechanism, the output of the system stimulates the system in such a way as to further increase the output. The feedback increases the strength and frequency of the contractions until the baby is born. After birth, the stretching stops and the loop is interrupted.

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