Topics:
Animal Physiology, Animal Refresher
Stimulus for Oxytocin Release
The stimulus for oxytocin release is:
- Stretch of cervix
- Suckling of teats
- Both a & b — Correct Answer
- None
Explanation:
Correct Answer: Both a & b
Oxytocin release from the posterior pituitary is stimulated by both the stretch of cervix and the suckling of teats (via a neuroendocrine reflex).
Oxytocin and Its Stimuli
1. Stretch of Cervix (Ferguson Reflex)
- During parturition, the fetal head/body stretches the cervix → mechanoreceptors in cervix send signals via vagus/pelvic nerves to hypothalamus → oxytocin release from posterior pituitary → uterine contractions intensify → positive feedback loop until delivery.
- This is the Ferguson Reflex — a classic neuroendocrine positive feedback.
2. Suckling of Teats (Milk Let-Down Reflex)
- Calf suckles → sensory nerve impulses from teats → travel to hypothalamus → oxytocin released → binds to myoepithelial cells of mammary gland alveoli → milk ejection (milk let-down).
- This reflex can be conditioned — the sound of a milking machine or the sight of a calf can trigger oxytocin release in a conditioned cow.
Other Oxytocin Functions
- Promotes social bonding (pair bonding, maternal behavior).
- Known as the 'love hormone' or 'bonding hormone.'
📚 About this Topic — Animal Physiology
This multiple choice question is from Animal Physiology, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Physiology to strengthen your preparation.
