CAPE Biology Unit 2 · 2013 · Paper 1 · Question Q21
Item 21 refers to the following graph which shows changes in blood pressure in the left ventricle during the cardiac cycle. Valves open and close due to changes in pressure. Which of the following labels, I, II, III and IV, correctly identifies the point on the graph when the aortic valve closes?
- (A)I
- (B)II
- (C)III
- (D)IV
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