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Life Sciences Paper 1, November 2024, question 2.2.6

Life Sciences P1 · Human reproduction
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In a healthy woman who is not pregnant, the progesterone level in her blood rises after ovulation, peaks at about day 20 of her cycle and then falls sharply to a low level by day 28, as the next period begins. In a woman who becomes pregnant, the progesterone level does not fall at the end of the cycle.
2.2.62 marks
Explain what causes the progesterone level to stay high instead of falling, in a woman whose egg has been fertilised and has implanted in the uterus.

NSCBased on Nov 2024 · Paper 1 · Q2.2.6

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What examiners found

The high progesterone level in pregnancy was explained by what the hormone does. The reason is that the corpus luteum stays active and the placenta adds progesterone.

In our words. Source: Department of Basic Education, NSC 2024 Diagnostic Report, Part 1 (Book 1), Q2.2.6.

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