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Start with the full category, then apply the exact boundary: Include left or right. A valve, vessel or the unspecific word ventricle is not a chamber name. You only need one qualifying answer. A longer name is not automatically rarer.
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Shortest accepted input at 65+ points
Left atriumLeft atrium · 75 points · 11 characters
The left atrium receives oxygen-rich blood from the lungs.
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Left atrium75 points · Shortest accepted spelling: Left atrium
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- Apply the complete question boundary: Include left or right. A valve, vessel or the unspecific word ventricle is not a chamber name.
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Each entry belongs to the bounded set defined by the prompt. The named source supports the underlying facts; our editorial scoring is a separate layer.
Source: NHLBI · How the heart works ↗
Reference version: 2026-10-21. See our answer policy for how we handle aliases and omissions.