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1. ±«Óãtvostasis

The maintenance of a constant internal environment in the body.

2. The human nervous system

Dr Alex Lathbridge breaks down how neurotransmitters travel across a synapse.

3. The human endocrine system

Dr Alex Lathbridge explains hormones and the six key glands that produce them.

4. Blood glucose

Dr Alex Lathbridge examines what happens if blood glucose levels get too high or too low.

5. Hormones and the menstrual cycle

Dr Alex Lathbridge explains what happens at each stage of the menstrual cycle.

6. The brain and eye

Dr Alex Lathbridge breaks down the structure of the brain and the eyes.

7. Water and nitrogen balance

How the kidneys maintain water levels in the body and how nitrogen is balanced.

8. Plant hormones

How hormones help plants to grow in response to light and gravity.