A-LevelBiologyTransport in mammals9700/12 · May/June 2021 · Q281 Mark

The graph shows pressure changes in different parts of the heart during a mammalian cardiac cycle. W, X, Y and Z indicate when a valve opens or closes. [Figure 28.1] Which row is correct?

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AW: opens, X: closes, Y: closes, Z: opens

BW: opens, X: opens, Y: closes, Z: opens

CW: closes, X: opens, Y: closes, Z: opens

DW: closes, X: closes, Y: opens, Z: opens

✓ Correct answer

C: W: closes, X: opens, Y: closes, Z: opens

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Topic: Transport in mammals, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2021 Paper 1 Variant 2, question 28.

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