Name the chambers of the heart that oxygenated blood passes through after returning from the lungs, before it is pumped to the rest of the body.
Generated by claude-sonnet-4-6 · 2026-06-26 00:59 · grounding rag
Model Answer
After returning from the lungs, oxygenated blood passes through the following chambers of the heart:
- Left Atrium – Oxygen-rich blood from the lungs first enters the left atrium (the thin-walled upper chamber on the left). The left atrium relaxes while collecting this blood.
- Left Ventricle – As the left atrium contracts, blood is transferred to the left ventricle (the lower chamber). Being muscular, the left ventricle then contracts and pumps the oxygenated blood out to the rest of the body.
Thus, oxygenated blood passes through two chambers — the left atrium and the left ventricle — before being distributed to the body.
Source: Chapter 5, Section 5.4.1 – Transportation in Human Beings
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Explanation
- Examiners expect you to name both chambers in order: left atrium → left ventricle.
- Mentioning the action (relaxes/contracts) for each chamber adds accuracy and earns full marks.
- A common mistake is naming the right-side chambers — remember, the right side deals with deoxygenated blood going to the lungs; the left side brings oxygenated blood back from the lungs and sends it to the body.
- For 3 marks, expect 1 mark for each chamber named and 1 mark for the correct sequence/explanation of flow.