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Homeostasis and response - GCSE Biology - BBC Bitesize

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GCSE Biology Homeostasis and response learning resources for adults, children, parents and teachers.

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Puberty is the stage in life when a child's body develops into an adult's body. The changes take place gradually, usually between the ages of 10 and 16.

testosterone - produced by the testes - controls the development of male secondary sexual characteristics

- produced by the ovaries - controls the development of female secondary sexual characteristics

The menstrual cycle

The menstrual cycle is a recurring process which takes around 28 days. During the process, the lining of the is prepared for pregnancy. If pregnancy does not happen, the lining is then shed. This is known as .

Hormones in the menstrual cycle

Several hormones control this cycle - for example, they are involved in controlling the release of an egg each month from an ovary, and changing the thickness of the uterus lining.

If a woman becomes pregnant, the produces progesterone. This maintains the lining of the uterus during pregnancy and means that menstruation does not happen.

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BBC Bitesize - GCSE Biology (Single Science) - Reproduction in humans - Revision 3

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Puberty is the stage in life when a child's body develops into an adult's body. The changes take place gradually, usually between the ages of 10 and 16. testosterone - produced by the testes - controls the development of male secondary sexual characteristics - produced by the ovaries - controls the development of female secondary sexual characteristics The menstrual cycle is a recurring process which takes around 28 days.

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A secondary school revision resource for OCR 21st Century Additional GCSE Science about the brain, mind and how drugs affect our nervous system including reflex arc, how synapses work and drugs and synapses.

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This GCSE BBC Bitesize video is from the original programmes from 2000 that were broadcast on BBC2. It covers the areas of the Biology foundation paper. Select the, "more from," or type jamjarmmx into your search for the other Biology clips as well as the Physics and Chemistry clips.

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GCSE BBC Science Bitesize - The Nervous System

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This GCSE BBC Bitesize video is from the original programmes from 2000 that were broadcast on BBC2. It covers the areas of the Biology foundation paper. Select the, "more from," or type jamjarmmx into your search for the other Biology clips as well as the Physics and Chemistry clips.