Which hormone primarily stimulates uterine contractions during labour?
A) Follicle-stimulating hormone
B) Insulin
C) Luteinising hormone
D) Thyrotropin
E) Oxytocin
IMAT 2026 · Question 21
Q21 - Hormonal axes and endocrine control
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The correct answer is E) Oxytocin.
Oxytocin is released by the posterior pituitary and makes the smooth muscle of the uterus contract. The baby pressing on the cervix triggers more oxytocin, which causes stronger contractions: a classic positive feedback loop that stops at birth.
A) Incorrect: FSH stimulates the growth of ovarian follicles (and sperm production in men).
B) Incorrect: Insulin lowers blood glucose.
C) Incorrect: LH triggers ovulation and the formation of the corpus luteum.
D) Incorrect: Thyrotropin (TSH) stimulates the thyroid to release T3 and T4.
E) Correct: Oxytocin stimulates uterine contractions during labour.
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