Heart | Structure, Function, Diagram, Anatomy, & Facts | Britannica
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.

Heart (band) - Wikipedia
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).

American Heart Association | To be a relentless force for a world of ...
Learn more about the American Heart Association's efforts to reduce death caused by heart disease and stroke. Also learn about cardiovascular conditions, ECC and CPR, donating, heart disease information for healthcare professionals, caregivers, and educators and healthy living.

Heart: Anatomy & Function - Cleveland Clinic
Your heart is the main organ of your cardiovascular system, a network of blood vessels that pumps blood throughout your body.

Heart Anatomy, Function, and Blood Circulation - WebMD
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.

How the Heart Works - What the Heart Looks Like | NHLBI, NIH
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.

Heart disease - Symptoms and causes - Mayo Clinic
Learn about symptoms, causes and treatment of cardiovascular disease, a term describing a wide range of conditions that can affect the heart.

How the Heart Works | Congenital Heart Defects (CHDs) | CDC
Blood is carried through the body in blood vessels called arteries and veins. The process of moving blood through the body is called circulation. Together, the heart and vessels make up the cardiovascular system. The heart has four chambers (two atria and two ventricles).

How the Heart Works - The Heart | NHLBI, NIH
Learn about your heart’s anatomy, blood flow, electrical system and heartbeat, and heart conditions and diseases.

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