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Unformatted text preview: open mitral valve. When the ventricles are full, the mitral valve shuts. This prevents blood from flowing backward into the atria while the ventricles contract (squeeze). Ventricular contraction : blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs. Ventricular contraction: blood leaves the heart through the aortic valve, into the aorta and to the body. This pattern is repeated over and over, causing blood to flow continuously to the heart, lungs and body. A little animation: http://www.heartpoint.com/theheart.html A longer, narrated animation: http://www.nhlbi.nih.gov/health/dci/Diseases/hhw/hhw_pumping.html...
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- Spring '09