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CIE iGCSE Co-Ordinated Science B9.1 Circulatory systems Exam Style Questions Paper 2

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Question

Which statement about the human circulatory system is correct?

A. Blood flows through the aorta towards the heart.
B. Blood flows through the pulmonary artery towards the lungs.
C. Blood flows through the pulmonary vein away from the heart.
D. Blood flows through the vena cava away from the lungs.

▶️ Answer/Explanation
The pulmonary artery is the only artery in the body that carries deoxygenated blood, and it transports blood from the heart to the lungs for oxygenation. The aorta carries blood away from the heart, the pulmonary vein carries blood towards the heart, and the vena cava carries blood towards the heart from the body.
✅ Answer: (B)

Question

Which sequence is correct for part of the blood flow pathway in a mammal?

A. heart → pulmonary artery → lungs → pulmonary vein
B. heart → pulmonary vein → lungs → vena cava
C. lungs → pulmonary artery → heart → pulmonary vein
D. lungs → pulmonary vein → heart → pulmonary artery

▶️ Answer/Explanation
Deoxygenated blood leaves the heart through the pulmonary artery, travelling to the lungs.
At the lungs, gas exchange oxygenates the blood.
Oxygenated blood then returns to the heart through the pulmonary vein.
✅ Answer: (A)

Question

Students investigate the effect of exercise on heart rate.

The graph shows the results.

How long does it take for the heart rate to decrease to the resting rate after the student stops exercising?

A. 3 minutes
B. 5 minutes
C. 7.5 minutes
D. 9 minutes

▶️ Answer/Explanation
The student stops exercising at \(t = 6\) minutes, where the heart rate is 100 beats per minute.
The heart rate falls back to the resting rate of 60 beats per minute at \(t = 9\) minutes.
So the time taken to return to resting rate is \(9 – 6 = 3\) minutes.
✅ Answer: (A)

Question

Which statement about the mammalian circulatory system is correct?

A. The atria contract to send blood directly to the body.
B. The blood passes through the heart once for every complete circulation.
C. The blood travels from the heart to the lungs and then back to the heart.
D. The left ventricle contracts to send blood to the lungs.

▶️ Answer/Explanation
In a double circulation, blood passes through the heart twice. It is pumped from the heart to the lungs (pulmonary circulation) and back, then to the body (systemic circulation). The left ventricle pumps blood to the body, not the lungs.
✅ Answer: (C)
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