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CAIE IGCSE Biology 9.2.8 Relative Thickness of a the Muscle Questions

Practise relating atrial and ventricular muscle thickness to the pressure and distance over which each chamber pumps.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • identify the left ventricle as having the thickest muscular wall
  • explain that it generates high pressure to move blood around the entire body against greater resistance
  • explain why atrial walls are thinner than ventricular walls and the right ventricle is thinner than the left

CAIE IGCSE Biology 9.2.8 Relative Thickness of a the Muscle Questions question 1

[Maximum number: 2]

Fig. 4.1 shows a section through a human heart and the main blood vessels.

Fig. 4.1

Fig. 4.1

Explain why the heart wall at H is thicker than the heart wall at D in Fig. 4.1.

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