Unit 8 Pregnancy Parturition

Question 1

Where does fertilization typically occur?
a) Uterus
b) Vagina
c) Cervix
d) Fallopian tube

Answer 1

d) Fallopian tube

Explanation: Fertilization most commonly occurs in the ampulla region of the fallopian tube.

Question 2

What hormone is secreted by the early embryo to maintain the corpus luteum?
a) Estrogen
b) Progesterone
c) hCG
d) LH

Answer 2

c) hCG

Explanation: Human chorionic gonadotropin (hCG) mimics LH to maintain the corpus luteum and its progesterone production in early pregnancy.

Question 3

Which hormone dominates the luteal and early pregnancy phase to maintain the endometrium?
a) Estrogen
b) FSH
c) GnRH
d) Progesterone

Answer 3

d) Progesterone

Explanation: Progesterone maintains the uterine lining and prevents uterine contractions.

Question 4

What triggers the onset of parturition (labor)?
a) Positive feedback from oxytocin and prostaglandins
b) High progesterone only
c) Drop in estrogen
d) Decrease in fetal cortisol

Answer 4

a) Positive feedback from oxytocin and prostaglandins

Explanation: Stretch of the cervix stimulates oxytocin release, which promotes uterine contractions and prostaglandin synthesis—amplifying labor signals.

Question 5

What is the role of the placenta in hormone production later in pregnancy?
a) Stops hormone production after 8 weeks
b) Secretes estrogen and progesterone
c) Produces cortisol
d) Inhibits fetal cortisol

Answer 5

b) Secretes estrogen and progesterone

Explanation: The placenta takes over hormone production from the corpus luteum to support fetal development and maternal changes.