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Paper 4Theory (Extended)4 marks
Heart muscle wall thickness
Description
Heart muscle wall thickness differences
The left ventricle has the thickest muscle wall, the right ventricle has a thinner wall, and both atria have thin walls. This reflects the different pressures needed to pump blood to various parts of the body.
- a[1]
Identify Identify which ventricle has the thicker muscle wall.
Aim for approximately 1 distinct marking point.
- b[3]
Explain Explain why ventricles have thicker muscle walls than atria.
Aim for approximately 3 distinct marking points.
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