Biology 9700 · AS & A Level · The heart

The heart — practice question

The graph illustrates pressure changes in various regions of the heart during a mammalian cardiac cycle. W, X, Y and Z show the times when a valve opens or closes. Which row is the correct one?

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

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