Question

1. In the examples of homeostatic regulatory mechanisms given below, differentiate between the processes that operate by negative and positive loops.
   1. Control of blood glucose concentration
   2. Production of specific antibodies upon exposure to antigens
   3. Control of body temperature
   4. Aggregation of platelets to form a blood clot

Answer 1

A. Negative loop

B. Positive loop

C. Negative loop

D. Positive loop

• Responses that decreases the strength of initial stimulus is called as negative loop/feedback.
• Responses that increases strength of initial stimulus is called as positive feedback.
• Increase in Blood sugar stimulate release of insulin, which then act to decrease Blood sugar.
• Decrease in Blood sugar stimulate release of glucagon, which act to increase blood sugar.
• When B cells is activated by Antigen to produce antibody, this increases antibody production.
• Increase in body temprature, increase sweat production, causes vasodilation, all this process decrease temperature.
• Decreay in body temprature, caises vasoconstriction, cause shivering. This increases body temperature.

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