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Artwork of beating heart in four stages

Artwork of beating heart in four stages

P216/0179

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Credit

BSIP VEM / SCIENCE PHOTO LIBRARY BSIP VEM / SCIENCE PHOTO LIBRARY

Caption

Heart cycle. Illustration of four hearts in cross section, showing the stages of a heartbeat. Top (diastole): the two atria (red, top) fill with blood while the heart rests between beats. Right (atrial systole): the atria contract, squeezing blood into the ventricles (red, bottom). Bottom (ventricular systole): the ventricles contract, squeezing blood into the aorta (arched artery at top) and pulmonary artery (forked artery). Left (diastole): the empty heart rests until the atria fill again. The human heart beats continuously throughout life, contracting around 2500 million times in the average lifetime.

Release details

Model release not required. Property release not required.

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