IGCSE Biology / Blood and circulation

How heart rate changes during exercise and under adrenaline revision notes

Edexcel International GCSE Biology (4BI1), chapter 5: Blood and circulation, specification point 2.66. Part of the full course.

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During exercise, the heart beats faster to supply working muscles and remove carbon dioxide. It stays raised during recovery to repay the oxygen debt, while adrenaline can raise heart rate before exercise begins.

More lessons in Blood and circulation

• Why small organisms manage without a transport system and large ones cannot
• Double circulation
• The structure of the heart
• How the heart beats
• Coronary arteries and heart disease
• Adrenaline and the body's response
• Arteries, veins and capillaries
• Plasma, red cells, white cells and platelets
• Phagocytes, antibodies and clotting
• Vaccination, memory cells and the secondary response