Which of the following describes a positive feedback loop?
When blood sugar is low, the body sends hormones that increase blood sugar.
When the body senses that the heart rate is very high, it secretes hormones that decrease the heart rate.
When a pregnant woman begins to go into labor, the body sends hormones that increase the intensity of the labor contractions.
When someone is exercising intensely, the body sends hormones that increase oxygen supply for cellular respiration.

The correct answer to the question being presented above would be the third sentence of the choices. The situation wherein 'a pregnant woman begins to go into labor, the body sends hormones that increase the intensity of the labor contractions.' describes a positive feedback loop.

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jamuuj jamuuj · Answer 2 · 2018-09-06T18:30:56+02:00

Answer;

An example of positive feedback loop is;

-When a pregnant woman begins to go into labor, the body sends hormones that increase the intensity of the labor contractions.

Explanation;

-Feedback loops are therefore the process whereby a change to the system results in an alarm which will trigger a certain result. The result will then either increase the change to the system or reduce it to bring the system back to normal.

-Feedback loops are important because they allow living organisms to maintain homeostasis (maintenance of internal environment of the body constant).

-A positive feedback loop occurs in nature when the product of a reaction leads to an increase in that reaction. It moves a system further away from the target of equilibrium, by amplifying the effects of a product or event and occurs when something needs to happen quickly.