Question 12 0 1 poi What is a key difference between negative and positive feedb

Question

Question 12 0 1 poi What is a key difference between negative and positive feedback mechanisms? Negative feedback mechanisms are more uncommon in biological systems than positive feedback mechanisms which normally control more frequent events. Diseases many times only result from disturbances in positive feedback mechanism whereas a disturbance in negative feedback mechanisms do not cause disease Negative feedback mechanisms are more common in biological systems than positive feedback mechanisms which normally only control infrequent events. Negative feedback mechanisms produce a response by the control center that enhances the original stimulus whereas positive feedback mechanisms produce a response that reduces the effect of the original stimulus

Explanation / Answer

1) Negative feedback mechanisms are more common in biological systems than positive feedback mechanism which normally only control infrequent events - Positive feedback mechanism does not result in homeostasis and causes destabilizing effects in the body. It is mainly responsible for amplification of the changes caused by the stimulus. Positive feedback is relatively less common than negative feedback, since it leads to unstable condition and extreme state in the body. Many systems achieve homeostasis by Negative feed-back mechanism. Body temperature, blood glucose level, Blood PH, Blood pressure, Hormone level, Oxygen and Carbon-dioxide level, water and electrolyte balance etc are all controlled by negative feedback mechanism.

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