Menstrual Cycle/Pregnancy/Labour Hormones and Negative Feedback Loops

Question 1

Human Chorionic Gonadotropin (HCG) (What?)

Answer 1

Stimulates the Corpus Luteum to produce progesterone.

Question 2

Relaxin (What, When?)

Answer 2

Occurs during labor to loosen hip bones for birth. Produced by the placenta prior to the mother’s labor.

Question 3

Progesterone (What?)

Answer 3

Decreases during labor. Inhibits the shedding of the endometrium, and stimulates the uterine contractions.

Question 4

Oxytocin (What?)

Answer 4

Increases during labor. Stimulate the uterine contractions

Question 5

Prostaglandin (What?)

Answer 5

Increases during labor. Constricts blood vessels to minimize blood loss.