Relationships Among Organisms

Question 16 • FL-2000310-Biology 1 Sem 2

Which of the following describes a negative feedback loop?

Answer

When the heart rate is too high, the body sends hormones that continually increase the heart rate higher.

When a pregnant woman is in labor, the body sends hormones that increase the intensity of contractions, which then increases the secretion of the same hormones.

When blood sugar is too low, the body sends hormones that raise blood sugar until it reaches a typical level and hormone secretion slows.

When a person is jogging, the body sends hormones that continually decrease the rate of oxygen supply to the legs.

Explanation

A negative feedback loop reverses a change and reduces its response once conditions return toward normal. In choice C, hormones raise low blood sugar until it reaches a typical level, then hormone secretion slows. Choices A and B describe responses that amplify the original change, which is positive feedback.

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