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Clarify the differences in thickness between the muscle walls of the left and right ventricles, and between the atria and ventricles.

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Cambridge IGCSE BiologyTransport in animalsSupplement content

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Clarify the differences in thickness between the muscle walls of the left and right ventricles, and between the atria and ventricles

  • This point belongs to Heart, especially Heart outcomes.
  • You need to be able to clarify the differences in thickness between the muscle walls of the left and right ventricles, and between the atria and ventricles.
  • The key ideas to know are Explain.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

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Explain

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Paper 4 structured question: Heart

Paper 4Theory (Extended)5 marks

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.

ChamberMuscle Wall Thickness
Left ventricleThickest
Right ventricleThinner
Left atriumThin
Right atriumThin
  1. a

    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.

    [3]
  2. b

    State State one difference between the muscle walls of the atria and the ventricles.

    Aim for approximately 2 distinct marking points.

    [2]
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