Removing an ovary in the first three weeks of pregnancy is risky because the corpus luteum secretes:
Athyroxine, which sets the metabolic rate
Baldosterone, which balances body salts
Cadrenaline, which raises the heart rate
Dprogesterone, which maintains the pregnancy
Answer & Solution
Correct answer: D. progesterone, which maintains the pregnancy
1. After ovulation the ruptured follicle becomes the corpus luteum in the ovary.
2. The corpus luteum secretes progesterone.
3. Progesterone maintains the uterine lining so the embryo stays implanted and develops.
4. Removing the ovary that early removes the progesterone source, so the pregnancy is lost.
5. The placenta only takes over progesterone production at about 12 weeks, which is why the first three weeks are the vulnerable period.
_Source: NECTA ACSEE 2023 Biology 133/1, Question 5: Reproduction_
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