Question

Differentiate between positive and negative feedback mechanism

Answer 1

Answer:

For conceptually understanding the two terms so that you never forget,

Positive feedback does AMPLIFICATION. This mechanism will always give a positive feedback and drift further away from the mean point, be it in the positive direction or a negative direction. For example - Secretion of oxytocin during contractions while giving birth is positive feedback. The intensity of contractions keeps on increasing because the stretch receptors continue to send positive feedback to the CNS and oxytocin keeps on releasing.

Negative feedback does STABILIZATION. This mechanism always brings everything to the mean point. For example - Thermo regulation in warm blooded mammals. Their body temperature is always kept optimum regardless of the surrounding temperature, that is maintained at the mean point.

Answer 2

Differentiate between positive and negative feedback mechanism:

Positive feedback Mechanism:

• The key difference between a positive feedback mechanism and a negative feedback mechanism is the repercussions of the stimuli.
• A positive feedback mechanism increases its effect after stimulus approaches it.
• Platelets releases the stimuli for the activation of the blood coagulation factors which then act as positive regulators stimulating an amplification in the amount of these factors.

Negative feedback Mechanism:

• The negative feedback mechanism decreases its effect after the stimulus approach. The best way to exemplify is the mechanism of blood clotting.  
• Platelets releases the stimuli for the activation of the blood coagulation factors is a reverse process for negative feedback mechanism.