IGCSE Biology / Blood and circulation

Adrenaline and the body's response

Edexcel International GCSE Biology (4BI1), chapter 5: Blood and circulation, specification point 2.94. Part of the full course.

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Adrenaline is a hormone released during stress that prepares the body to fight or run. Its effects help get more oxygen and glucose to the muscles quickly, so they can respire faster.

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
• How heart rate changes during exercise and under adrenaline
• Arteries, veins and capillaries
• Plasma, red cells, white cells and platelets
• Phagocytes, antibodies and clotting
• Vaccination, memory cells and the secondary response