Name the blood vessel that brings (i) oxygenated blood (ii) deoxygenated blood, to the human heart. Also name that chamber of the heart which receives deoxygenated blood and state how deoxygenated blood from this chamber is sent to lungs for oxygenation.
Generated by claude-sonnet-4-6 · 2026-06-11 09:48 · grounding rag
Model Answer
(i) Oxygenated blood is brought to the heart by the pulmonary veins (from the lungs).
(ii) Deoxygenated blood is brought to the heart by the venae cavae (from the body).
The right atrium receives deoxygenated blood. When the right atrium contracts, the blood passes into the right ventricle, which then pumps it to the lungs through the pulmonary artery for oxygenation.
Source: Life Processes, Section 5.4.1
---
Explanation
- Examiners expect all three parts: name both vessels, name the chamber, and explain the mechanism of sending blood to lungs.
- Common mistakes: calling pulmonary veins "arteries" (they carry oxygenated blood but are still veins), or forgetting to mention the right ventricle's role in pumping blood to the lungs.
- The path is: Right atrium → contracts → Right ventricle → pumps → Pulmonary artery → Lungs.
- 1 mark each for (i) & (ii), and 1 mark for the chamber + mechanism together.