Place the events of parturition in the correct order.
(1)Stretch-sensitive neurons send signals to the hypothalamus.
(2)Oxytocin receptors increase in the uterus.
(3)Prostaglandin levels increase.
(4)Estradiol levels increase.
(5)Oxytocin levels increase.
(6)Uterine muscles start to contract.
A)1,2,4,5,3,6
B)4,2,1,5,6,3
C)5,2,4,1,3,6
D)1,6,4,2,5,3
E)4,3,1,2,5,6

Question

Quizplus · Accepted Answer

The correct order of events during parturition is as follows:
1. Estradiol levels increase, which leads to an increase in oxytocin receptors in the uterus. (4,2)
2. Stretch-sensitive neurons send signals to the hypothalamus, which then releases oxytocin. (1,5)
3. Prostaglandin levels increase, further promoting uterine contractions. (3)
4. Uterine muscles start to contract. (6)
Therefore, the correct order is 4,2,1,5,6,3, which corresponds to choice B.

Place the Events of Parturition in the Correct Order