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The cycle begins with FSH

The cycle begins with FSH

Flowchart showing FSH, oestrogen, LH and progesterone interactions across a 28-day menstrual cycle

At the end of a cycle, blood concentrations of oestrogen and progesterone are low. This means there is little inhibition of the pituitary gland, so the pituitary secretes follicle-stimulating hormone, or FSH.

3.2.4 Interactions of reproductive hormones Lesson

  1. GCSE
  2. /Biology
  3. /3.2.4 Interactions of reproductive hormones

Step-by-step lessons on OCR GCSE Biology 3.2.4 Interactions of reproductive hormones. Each one builds up to exam-style questions. Start with the foundational topics and build up to the higher-tier material.

Lessons