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GCSE Physical Education · key term
An upper chamber of the heart that receives blood and pumps it into a ventricle. The heart has a right atrium and a left atrium.
Used by AQA and OCR
Paper 1
Revise: Heart structureThe two upper chambers are the atria: the right atrium and left atrium. The two lower chambers are the ventricles: the right ventricle and left ventricle. An individual upper chamber is called an atrium.
Paper 1
An upper chamber of the heart that receives blood returning to the heart. The plural is atria.
Revise: Cardiovascular System Structure and FunctionThere, blood gains oxygen and loses carbon dioxide before returning to the left atrium.
Use the full chamber name when labelling: for example, 'right atrium', not just 'atrium'.
Atrium is singular; atria is plural. Ventricle is singular; ventricles is plural.
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