Question

Which of the following involves positive feedback inhibition?

• A. Lactation
• B. Blood clotting
• C. Ovulation
• D. All of the above

Answer 1

The correct option is D All of the above

Positive feedback is a process that occurs in a feed back loop in which the effects of a small disturbance on a system include an increase in the magnitude of the perturbation.

Lactation involves positive feedback in that as the baby suckles on the nipple there is a nerve response into the spinal cord and up into the hypothalamus of the brain, which then stimulates the pituitary gland to produce more prolactin to produce more milk.

In blood clotting the loop is initiated when injured tissue releases signal chemicals that activate platelets in the blood. An activated platelet releases chemicals to activate more platelets, causing a rapid cascade and the formation of a blood clot.

And a spike in estrogen during the follicular phase of the menstrual cycle causes ovulation.

So, the correct answer is option D.