CIE iGCSE Co-Ordinated Science B9.2 Heart Exam Style Questions Paper 2
▶️ Answer/Explanation
This requires the ventricular pressure to be higher than the aortic pressure, but the two values should still be reasonably close since the valve has only just opened.
Row C (16.0 in the ventricle, 10.0 in the aorta) is the only row where ventricular pressure exceeds aortic pressure at the point blood starts to be ejected.
✅ Answer: (C)
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
Ans: 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
Answer: A. 3 minutes
Explanation: The graph shows that the heart rate returns to the resting rate approximately 3 minutes after the student stops exercising.
Question
Which row shows the state of the heart valves whilst the atria are contracting and the ventricles are relaxing?
▶️Answer/Explanation
Answer: A) open, closed
Explanation: When the atria contract, blood flows into the ventricles, so the atrioventricular valves (between the atria and ventricles) are open. The semilunar valves (between the ventricles and arteries) are closed to prevent backflow of blood into the ventricles.