🔬 Biology · Human Reproduction · NEET

At parturition, the foetal ejection reflex is a positive feedback loop in which uterine contractions stimulate further release of:

Answer: Oxytocin from the maternal pituitary.

A FSH from the anterior pituitary
B Progesterone from the corpus luteum
C Oxytocin from the maternal pituitary
D Relaxin from the placenta only

Correct answer: C. Oxytocin from the maternal pituitary

Explanation: Stretching of the uterus and cervix stimulates oxytocin release, which intensifies contractions in a positive feedback loop driving childbirth.

Sagittal section of the human male reproductive system showing the testis, epididymis, vas deferens, seminal vesicle, prostate gland, bulbourethral gland, urethra, urinary bladder and penis

The human male reproductive system: sperm formed in the testis mature in the epididymis and travel via the vas deferens, mixing with secretions of the seminal vesicle, prostate and bulbourethral glands. Image: Wumingbai, CC BY-SA 4.0, via Wikimedia Commons.

Concept context

Male and female reproductive systems, gametogenesis, fertilization, implantation, pregnancy, and reproductive health.

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At parturition, the foetal ejection reflex is a positive feedback loop in which uterine contractions stimulate further release of:

Concept context

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