IGCSE Biology / Blood and circulation

Plasma, red cells, white cells and platelets

Edexcel International GCSE Biology (4BI1), chapter 5: Blood and circulation, specification point 2.59, 2.60, 2.61. Part of the full course.

Read the revision notes · IGCSE Biology past papers

Blood is a tissue made of plasma, red blood cells, white blood cells and platelets. Each component has a different role, from transporting substances to defending the body and starting blood clotting.

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
• Adrenaline and the body's response
• Arteries, veins and capillaries
• Phagocytes, antibodies and clotting
• Vaccination, memory cells and the secondary response