A-LevelBiologyTransport in mammals9700/12 · May/June 2017 · Q261 Mark
The graph shows pressure changes during a cardiac cycle. [Graph showing pressure/kPa vs. time/s with curves labeled W, X, Y, Z] Which row correctly identifies W, X, Y, and Z? [Table with columns W, X, Y, Z and rows A, B, C, D with valve states]
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AW atrioventricular valves close, X semi-lunar valves close, Y semi-lunar valves open, Z atrioventricular valves open
BW atrioventricular valves close, X semi-lunar valves open, Y semi-lunar valves close, Z semi-lunar valves open
CW semi-lunar valves close, X atrioventricular valves open, Y atrioventricular valves close, Z semi-lunar valves open
DW semi-lunar valves open, X atrioventricular valves close, Y atrioventricular valves open, Z semi-lunar valves close
✓ Correct answer
B: W atrioventricular valves close, X semi-lunar valves open, Y semi-lunar valves close, Z semi-lunar valves open
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