Hormones, the menstrual cycle and reproduction

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Question 48

A student is studying the hormonal control of the menstrual cycle. The graph below shows the blood concentrations of oestrogen and luteinising hormone (LH) during the first 14 days of a typical cycle.

Line graph showing blood concentrations of oestrogen and LH from day 1 to day 14 of the menstrual cycle. Oestrogen levels start low, rise steadily to a high peak around day 12, and then begin to fall. LH levels remain low and flat until day 12, where they rapidly surge to a very high peak on day 13, then drop sharply immediately before ovulation on day 14.

Explain how the changes in oestrogen and LH levels interact to cause ovulation.

[3]

Hormones, the menstrual cycle and reproduction

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Question 48

A student is studying the hormonal control of the menstrual cycle. The graph below shows the blood concentrations of oestrogen and luteinising hormone (LH) during the first 14 days of a typical cycle.

Line graph showing blood concentrations of oestrogen and LH from day 1 to day 14 of the menstrual cycle. Oestrogen levels start low, rise steadily to a high peak around day 12, and then begin to fall. LH levels remain low and flat until day 12, where they rapidly surge to a very high peak on day 13, then drop sharply immediately before ovulation on day 14.

Explain how the changes in oestrogen and LH levels interact to cause ovulation.

[3]

Hormones, the menstrual cycle and reproduction

Question 48

Hormones, the menstrual cycle and reproduction Questions

Hormones, the menstrual cycle and reproduction

Question 48

Hormones, the menstrual cycle and reproduction Questions