CIE iGCSE Co-Ordinated Science B9.3 Blood vessels Exam Style Questions Paper 1
▶️ Answer/Explanation
Veins carry blood back to the heart under low pressure. The valves inside veins prevent the backflow of blood, ensuring that blood flows in one direction towards the heart.
This is essential for maintaining circulation against gravity.
✅ Answer: (C)
This is essential for maintaining circulation against gravity.
✅ Answer: (C)
▶️ Answer/Explanation
Red blood cells are packed with haemoglobin, a protein that combines with oxygen to form oxyhaemoglobin in the lungs and releases oxygen to body tissues.
Glucose, insulin, and urea are dissolved in the plasma and transported in solution — not inside red blood cells.
✅ Answer: (C)
Glucose, insulin, and urea are dissolved in the plasma and transported in solution — not inside red blood cells.
✅ Answer: (C)
▶️ Answer/Explanation
Blood from the vena cava travels to the lungs via the pulmonary artery to become oxygenated.
It returns via the pulmonary vein to the heart, then leaves through the aorta.
From the aorta, oxygenated blood reaches the kidney via the renal artery.
✅ Answer: (A)
It returns via the pulmonary vein to the heart, then leaves through the aorta.
From the aorta, oxygenated blood reaches the kidney via the renal artery.
✅ Answer: (A)
▶️ Answer/Explanation
The pulmonary vein carries oxygenated blood from the lungs back to the heart.
Veins carry blood towards the heart, so the correct vessel is the one with its arrow pointing from the lungs into the heart.
This corresponds to vessel B in the diagram.
✅ Answer: (B)
Veins carry blood towards the heart, so the correct vessel is the one with its arrow pointing from the lungs into the heart.
This corresponds to vessel B in the diagram.
✅ Answer: (B)