Male and Female Reproductive Hormones Revision Notes | GCSE OCR Foundation Biology

What this lesson covers

Explore the main reproductive hormones in males and females, including testosterone and oestrogen, and understand how they control puberty and the devel...

• Explain how reproductive hormones cause secondary sex characteristics to develop during puberty
• Describe the role of oestrogen in the female reproductive system and the menstrual cycle
• Explain how testosterone stimulates sperm production in males
• Compare the functions of male and female reproductive hormones

Key ideas to keep in view

Use this lesson to stay inside B3.2 Coordination and control - the endocrine system while connecting the detail back to the wider B3: Organism level systems topic.

• B3: Organism level systems
• B3.2 Coordination and control - the endocrine system
• GCSE OCR Foundation Biology

Lesson notes preview

Read the core explanations from Male and Female Reproductive Hormones before testing yourself from memory.

• 1. The Hormone Revolution - What Happens at Puberty?
• Picture a 12-year-old and an 18-year-old standing side by side. The differences are dramatic - height, voice, body shape, facial features. What caused this transformation? The answer lies in powerful chemical messengers called reproductive hormones.
• During puberty, your body starts producing reproductive hormones in much larger quantities. These hormones don't just prepare your body for reproduction - they trigger a complete physical makeover. Voice breaking, growth spurts, body hair appearing - all controlled by hormones.
• Physical features that develop during puberty but are not directly involved in reproduction. Examples include deepening voice, body hair growth, breast development, and changes in body shape.
• Trap: Many students think secondary sex characteristics are the same as primary sex characteristics. Actually, primary characteristics are the reproductive organs you're born with (penis, vagina, ovaries, testes). Secondary characteristics develop later during puberty.
• In females, the star player is oestrogen. This hormone is produced mainly by the ovaries and becomes the conductor of the female reproductive orchestra. But oestrogen doesn't just appear overnight - its production ramps up dramatically during puberty.
• The main female reproductive hormone produced in the ovary. Controls egg maturation, triggers ovulation, and causes female secondary sex characteristics to develop.
• Here's what makes oestrogen fascinating: at puberty, eggs begin to mature for the first time. Before puberty, a girl's ovaries contain thousands of immature eggs that have been waiting since before birth. Oestrogen wakes them up.
• Once the menstrual cycle begins, oestrogen orchestrates a precise 28-day rhythm. One egg matures and gets released approximately every 28 days - this release is called ovulation. The timing isn't random; it's oestrogen controlling the show.
• The release of a mature egg from the ovary, occurring approximately every 28 days in the menstrual cycle. Triggered by hormonal changes including oestrogen.

Continue through the topic

Move to the related lessons or back to the topic page when you need the wider sequence before exam-style practice.