Uploaded March 2026 | Updated September 2026, 1 week ago

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How does blood flow through the heart? This animation explains the function and structure of the heart, including how blood flows into, through and out of it.

More information on how the heart works at bhf.org.uk/yourheart

This animation has been supported by Royal Mail in partnership with British Heart Foundation.

00:08 How the heart works
00:20 Structure of the heart (electrical conduction system)
00:29 Chambers of the heart
00:53 Valves of the heart
01:14 Layers of the heart
01:35 Coronary arteries