Many animals have a heart and circulatory system.
Five litres of blood can pass through a human heart each minute.
Calculate the volume of blood that passes through this heart in 24 hours.
Give your answer in standard form.
Blood leaves the heart through the arteries.
Compare and contrast the structure of the aorta with the structure of the pulmonary artery.
Blood returns to the heart through the veins.
The diagram shows the outline of a vein. The direction of flow of blood is also shown.
Complete and label the diagram to show the structures present in a vein
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