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CAIE IGCSE Biology 16.5.3 Sources of Oestrogen & Progesterone

Practise distinguishing where oestrogen and progesterone are produced during the menstrual cycle and pregnancy.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • identify the ovaries as sources of oestrogen and progesterone during the menstrual cycle
  • identify the placenta as a major source of both hormones during pregnancy
  • link sustained progesterone production in pregnancy to maintenance of the uterine lining

16.5.3—Sites of production of oestrogen question 1

[Maximum number: 1]

Fig. 1.1 shows the changes in the concentration of two hormones involved in the menstrual cycle.

Fig. 1.1

Fig. 1.1

State the main site of progesterone production during pregnancy.

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