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Introduction In this introduction you will find information on what happens when you do exercise and what happens to your heart as you grow up. You will know about aerobic and anaerobic respiration. We will also do an experiment to check how long it takes your heart rate to go back to your recovery rate. The Heart: The muscular walls of the ventricles contract and relax continually. Every time the muscle contract, blood is pushed out through the outlet valves and into the arteries. The surge of blood causes your heartbeat. You can feel this surge of blood as a pulse in the arteries, at your wrist. The ventricles have a very thick wall made of strong muscles fibres. They need to be strong because they pump about 70 times every minute up to about 37 000'000 Exercise can help you lose weight by burning calories and increasing metabolism. It also helps you handle...

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