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