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Hormones - What are they and what do they do?

A hormone (from Greek όρμή - "to set in motion") is a chemical messenger that carries a signal from one cell (or group of cells) to another via the blood. Put simply, they are chemicals which regulate how target cells behave.

Learn about the different types of hormones and there effects, as well as where they are produced HERE.

Find out and describe how hormones regulate the menstrual cycle and how 'the pill' works below:

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