DP Biology (first assessment 2025)

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Question 23M.1A.HL.TZ2.27

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Date May 2023 Marks available [Maximum mark: 1] Reference code 23M.1A.HL.TZ2.27
Level HL Paper 1A Time zone TZ2
Command term Question number 27 Adapted from N/A
27.
[Maximum mark: 1]
23M.1A.HL.TZ2.27

The diagram shows the pressure changes in the left atrium, left ventricle and aorta during part of the cardiac cycle.

Are the valves between the atria and the ventricles open or closed at time X and time Y?

  Time X Time Y
A.   open open
B.   open closed
C.   closed open
D .  closed closed

[1]

Markscheme

B

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