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Paper 4Theory (Extended)5 marks
Heart muscle wall thickness
Diagram Description
Diagram of the heart showing muscle wall thickness
A diagram shows the heart with labels indicating the thickness of the muscle walls of the left ventricle, right ventricle, left atrium, and right atrium. The left ventricle wall is the thickest, the right ventricle wall is thinner, and both atria have thin walls.
| Chamber | Muscle Wall Thickness |
|---|---|
| Left ventricle | Thickest |
| Right ventricle | Thinner |
| Left atrium | Thin |
| Right atrium | Thin |
- a[3]
Explain Explain why the muscle wall of the left ventricle is thicker than that of the right ventricle.
Aim for approximately 3 distinct marking points.
- b[2]
State State one difference between the muscle walls of the atria and the ventricles.
Aim for approximately 2 distinct marking points.
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