CAIE IGCSE Biology 9.2.8 Heart Chamber Wall Thickness
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
9.2.8—Relative thickness of: (a) the muscle question 1
Mammals have a double circulation.
Fig. 2.1 is a diagram of a section through the heart of a mammal. The arrows show the direction of blood flow through the heart and blood vessels.
Fig. 2.1
State the name of the chamber of the heart with the thickest wall.
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