4 days ago · 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 …

The heart is a muscular organ found in humans and other animals. This organ pumps blood through the blood vessels. 1 The heart and blood vessels together make the circulatory …

Jan 26, 2024 · What is the heart? The heart is a fist-sized organ that pumps blood throughout your body. It’s your circulatory system ’s main organ. Muscle and tissue make up this …

Jul 7, 2025 · 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, …

Aug 22, 2024 · 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.

9 hours ago · Some “silent heart attack” symptoms are so subtle you won’t know you’ve had a heart attack at all. Here are 6 symptoms experts say you should learn to spot.

Mar 24, 2022 · Your heart is in the center of your chest, near your lungs. It has four hollow chambers surrounded by muscle and other heart tissue. The chambers are separated by heart …

Jun 11, 2024 · The heart is a vital, fist-sized muscular organ located slightly on the left side of the chest. It consists of four main chambers: two atria and two ventricles. Understanding its basic …

Jan 8, 2025 · The seven main functions of the heart include pumping blood throughout the body, delivering oxygen to tissues, removing waste from tissues, controlling heart rate, maintaining …

Oct 4, 2024 · 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 …