Biological termModerate1 mark
1(a)
Name the following:
The pituitary hormone which stimulates contraction of uterus during child birth.
Topic: Oxytocin
Previous-year question practice database
Answer
Exam answer
OXYTOCIN.
Explanation
Oxytocin, from the POSTERIOR lobe of the pituitary, causes the powerful contractions of the uterine muscles that push the baby out during labour. It also causes the ejection of milk from the mammary glands.
THE SHORTCUT worth carrying: the POSTERIOR pituitary releases only TWO hormones — OXYTOCIN and ADH (vasopressin). Anything else named as a pituitary hormone must be ANTERIOR.
Note the neat opposition examiners like: PROGESTERONE PREVENTS uterine contractions and maintains pregnancy; its level falls just before labour, which is what allows OXYTOCIN to act.
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