At P on Figure 3, the pressure in the left ventricle is increasing - AQA - A-Level Biology - Question 3 - 2020 - Paper 1
Question 3
At P on Figure 3, the pressure in the left ventricle is increasing. At this time, the rate of blood flow has not yet started to increase in the aorta. Use evidence f... show full transcript
Worked Solution & Example Answer:At P on Figure 3, the pressure in the left ventricle is increasing - AQA - A-Level Biology - Question 3 - 2020 - Paper 1
Step 1
Aortic/semi-lunar valves are closed
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Answer
At point P, the aortic valve is closed, preventing blood from flowing into the aorta despite the increase in left ventricular pressure.
Step 2
Pressure in aorta higher than in ventricle
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Answer
The pressure in the aorta is higher than that in the ventricle, which keeps the aortic valve closed and stops blood flow into the aorta.
