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
Use evidence from Figure 3 to explain why.
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Answer
The pressure in the aorta is higher than in the left ventricle at point P; therefore, the aortic valves remain closed. This prevents blood from flowing into the aorta despite the increasing pressure in the ventricle.
Step 2
Explain how this happens and its importance.
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Answer
At point Q, the elastic recoil of the arterial walls causes a slight increase in pressure, which helps to smooth the blood flow and maintain a consistent rate of blood flow despite the volume changes. This is crucial for ensuring that blood reaches all parts of the body efficiently.
Step 3
Similarity
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Answer
Both curves will show peaks corresponding to the contractions of the ventricles.
Step 4
Difference
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Answer
The right ventricle curve might show lower pressure values compared to the left ventricle due to the different pressures generated in each chamber.
Step 5
Use information from Figure 3 to calculate the heart rate of this dog.
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Answer
The heart rate of the dog is calculated to be 167 beats minute-1.
Step 6
Name two other variables the student should have kept constant during this investigation.
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