A-LevelBiologyTransport in mammals9700/12 · Oct/Nov 2012 · Q301 Mark
The graph shows the pressure changes in the left atrium, left ventricle and aorta during one cardiac cycle. [Figure 30.1] With reference to the semilunar valve and atrioventricular valve, what is happening at points 1, 2, 3 and 4?
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Asemilunar valve opens: 1, semilunar valve closes: 2, atrioventricular valve opens: 3, atrioventricular valve closes: 4
Bsemilunar valve opens: 1, semilunar valve closes: 2, atrioventricular valve opens: 4, atrioventricular valve closes: 3
Csemilunar valve opens: 2, semilunar valve closes: 3, atrioventricular valve opens: 1, atrioventricular valve closes: 4
Dsemilunar valve opens: 2, semilunar valve closes: 3, atrioventricular valve opens: 4, atrioventricular valve closes: 1
✓ Correct answer
B: semilunar valve opens: 1, semilunar valve closes: 2, atrioventricular valve opens: 4, atrioventricular valve closes: 3
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