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Human blood circulation and the heart

Organisation in animals and plants · Lesson 2 of 5

Lesson 2 of 5

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Lesson 2 of 5 · Organisation in animals and plants

Human blood circulation and the heart

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Describe the structures and functions of the components of blood, including plasma, red blood cells, white blood cells, platelets and the transport of substances such as oxygen, carbon dioxide, urea, digested food and hormones.
Compare the structure and function of arteries, veins and capillaries, including wall thickness, lumen size, valves, pressure and exchange surfaces.

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Explain the sequence of blood flow through the heart, lungs and body, including the role of valves and the difference between oxygenated and deoxygenated blood.

Explain coronary heart disease as the narrowing or blockage of coronary arteries, and evaluate the use of treatments such as stents, bypass surgery, drugs, artificial pacemakers, artificial valves or transplants where specified by the exam board.

Interpret information about cardiovascular risk factors, including diet, smoking, lack of exercise and inherited factors, and apply this to maintaining health.

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