Exam (elaborations)
AQA Biology Alevel - Exchange of substance
- Module
- Exchange in substance
- Institution
- AQA
Mass transport in animals
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Q1.Scientists investigated the effect of a 6-week exercise programme on the resting heart rateof males and females.
The scientists recruited a large group of male volunteers and a large group of female
volunteers. They measured the resting heart rate of each volunteer before the exercise
programme. Both groups took part in the same exercise programme. The scientists
measured the resting heart rate of each volunteer after the exercise programme.
The scientists determined the mean resting heart rate and the range of resting heart rates
for each group before and after the exercise programme. The graph shows their results.
(a) What was the range of the resting heart rates in males after the exercise
programme?
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(1)
(b) Calculate the percentage decrease in the mean resting heart rate of females after
the exercise programme. Show your working.
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PhysicsAndMathsTutor.com
, Answer = ............................ %
(2)
(c) The scientists used the percentage change in the mean resting heart rate after the
exercise programme to compare the results for males and females.
Explain why they used percentage change in the resting heart rate.
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(2)
(d) The scientists calculated the cardiac output of the volunteers before and after the
exercise programme. In some volunteers, their cardiac output stayed the same,
even though their resting heart rate decreased.
Explain how their cardiac output could stay the same even when their resting heart
rate had decreased.
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(2)
(Total 7 marks)
Q2.(a) What is the function of the coronary arteries?
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PhysicsAndMathsTutor.com
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