Question

which of the following is an example of a normal physiological process that uses a positive feedback loop?

• water balance
• body temperature regulation
• blood pressure regulation
• blood sugar balance
• blood clotting

Explanation:

1. Analyze each option:

• Water balance: Uses negative feedback (e.g., ADH regulation to retain or excrete water to maintain balance).
• Body temperature regulation: Negative feedback (e.g., sweating or shivering to return to set - point).
• Blood pressure regulation: Negative feedback (mechanisms to keep BP within normal range).
• Blood sugar balance: Negative feedback (insulin and glucagon work to maintain stable blood sugar).
• Blood clotting: Positive feedback. Once a blood vessel is damaged, factors are activated that further activate more clotting factors, amplifying the clotting process until the clot is formed.

Answer:

blood clotting