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Heart, organ that serves as a pump to circulate the blood. It may be as simple as a straight tube, as in spiders and annelid worms, or as complex as the four-chambered double pump that is the center of the circulatory system in humans, other mammals, and birds.
Your heart is the main organ of your cardiovascular system, a network of blood vessels that pumps blood throughout your body.
Learn about the anatomy of the heart and how its chambers, valves, and vessels work together to maintain effective blood circulation throughout the body to sustain life.
This image shows the four chambers of the heart and the direction that blood flows through the heart. Oxygen-poor blood, shown in blue-purple, flows into the heart and is pumped out to the lungs.
How the Heart Works - What the Heart Looks Like | NHLBI, NIH
Learn about the heart's anatomy, how it functions, blood flow through the heart and lungs, its location, artery appearance, and how it beats.
Help us create a healthier world free of heart disease and stroke. Since the American Heart Association’s founding in 1924, deaths from cardiovascular diseases have been cut in half. And yet, there are still so many lives to be saved.
American Heart Association | To be a relentless force for a ...
Heart is an American rock band formed in Seattle in 1967. The band evolved from previous projects led by the founding members Roger Fisher (guitar) and Steve Fossen (bass guitar), including The Army (1967–1969), Hocus Pocus (1969–1970), and White Heart (1970–1973).
