A-LevelBiologyTransport in mammals9700/12 · Oct/Nov 2010 · Q301 Mark
The graph shows pressure changes during a cardiac cycle. [Figure 30.1 showing a graph of pressure vs time with points W, X, Y, Z] Which row correctly identifies W, X, Y, and Z? W X Y Z
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Aatrio-ventricular valves close semi-lunar valves close semi-lunar valves open atrio-ventricular valves open
Batrio-ventricular valves close atrio-ventricular valves open semi-lunar valves open semi-lunar valves close
Csemi-lunar valves close atrio-ventricular valves open atrio-ventricular valves close semi-lunar valves open
Dsemi-lunar valves open atrio-ventricular valves close atrio-ventricular valves open semi-lunar valves close
✓ Correct answer
B: atrio-ventricular valves close atrio-ventricular valves open semi-lunar valves open semi-lunar valves close
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