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CAIE A-Level Biology AS 8.3.2 Wall Thickness Differences Questions

Explain wall-thickness differences among arteries, veins and capillaries using evidence from each question and mark scheme.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • Explain wall-thickness differences among arteries, veins and capillaries.

CAIE A-Level Biology AS 8.3.2 Wall Thickness Differences Questions question 1

[Maximum number: 1]

Aortic stenosis is a heart valve disorder in which the aortic semilunar valve opening is narrow.
Which effect could aortic stenosis have on heart structure and function?

A

The cardiac muscle of the left ventricle wall is thinned by blood leaking out of the left ventricle during ventricular diastole.

B

There is less cardiac muscle in the left ventricle and reduced diastolic blood pressure, caused by the smaller blood volume entering the left atrium.

C

The tendons of the heart valves are weakened by blood being forced back through the left atrioventricular valve into the left atrium.

D

The wall of the left ventricle thickens, leading to an enlarged heart and inability to relax and fill completely during diastole.

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