Hormones, the menstrual cycle and reproduction

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Question 10

The graph below shows the changes in blood plasma concentration of four hormones ( $W$ , $X$ , $Y$ , and $Z$ ) involved in the human menstrual cycle over 28 days.

Hormone concentrations during the menstrual cycle

A patient is administered a fertility drug that acts as a competitive antagonist at the receptors for hormone $X\,$ in the hypothalamus.

Which option correctly identifies hormone $X\,$ and predicts the effect of this drug on the blood concentrations of hormones $W\,$ and $Y\,$ during the first 10 days of the menstrual cycle?

Hormone $X$ : Progesterone
Effect: Both $W$ and $Y$ concentrations decrease

Hormone $X$ : Oestrogen
Effect: Both $W$ and $Y$ concentrations increase

Hormone $X$ : Oestrogen
Effect: Both $W$ and $Y$ concentrations decrease

Hormone $X$ : LH (Luteinising Hormone)
Effect: $W$ concentration increases and $Y$ concentration decreases

Hormones, the menstrual cycle and reproduction Questions

GCSE
Biology
Hormones, the menstrual cycle and reproduction

GCSE
Biology Edexcel
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