Understand: feedback in living systems

During the process of childbirth in humans, the fetus moves down the birth canal and puts pressure on the cervix, a structure located at the bottom of the uterus. This sends signals to the brain to trigger release of oxytocin, a hormone that causes contractions. As the uterus contracts, it causes additional pressure on the cervix, which leads to further release of oxytocin. This continues until the baby is born.

Which statement best explains the type of feedback loop involved in childbirth?

(Choice A)
Childbirth is controlled by positive feedback because the process results in a positive outcome, the birth of a new human.
(Choice B)
Childbirth is controlled by positive feedback because a stimulus is amplified and a process is brought to completion.
(Choice C)
Childbirth is controlled by negative feedback because a stimulus is dampened and conditions are brought back to an ideal range.

High school biology - NGSS

Course: High school biology - NGSS > Unit 2

Problem