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

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Question

Selexipag is a drug used to treat a condition where the blood pressure going to the lungs is too high. The drug works by widening the blood vessel leading to the lungs to reduce the pressure.
Which blood vessel going to the lungs is selexipag widening?

A. aorta
B. pulmonary artery
C. pulmonary vein
D. vena cava

▶️ Answer/Explanation
The pulmonary artery is the vessel that carries blood from the heart to the lungs; elevated pressure in this artery is the condition being treated (pulmonary arterial hypertension).
The pulmonary vein carries blood back from the lungs to the heart, while the aorta and vena cava are systemic vessels — none of these carry blood toward the lungs as arteries do.
✅ Answer: (B)

Question

An oxygenated red blood cell returns to the heart from the lungs. Which sequence describes the route the red blood cell follows as it delivers its oxygen to a kidney?

A. Left ventricle → aorta → renal artery

B. Left ventricle → aorta → renal vein

C. Right ventricle → aorta → renal artery

D. Right ventricle → aorta → renal vein

▶️Answer/Explanation

Answer: A. Left ventricle → aorta → renal artery

Explanation: Oxygenated blood from the lungs enters the left atrium, then the left ventricle, and is pumped into the aorta. From the aorta, it travels to the renal artery, which supplies blood to the kidneys.

Question

Which statement about the valves found in the human transport system is correct?

A. They are absent in veins.

B. They are present in arteries.

C. They ensure one-way flow of blood.

D. They pump blood from atria to ventricles.

▶️Answer/Explanation

Answer: C

Explanation: Valves in the human transport system, particularly in veins, ensure that blood flows in one direction, preventing backflow and maintaining efficient circulation.

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