[8] The heart pumps blood with a rhythm determined by a group of pacemaker cells in the sinoatrial node. These generate an electric current that causes the heart to contract, traveling …

Jul 13, 2025 · 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 …

Jan 26, 2024 · Your heart is the main organ of your cardiovascular system, a network of blood vessels that pumps blood throughout your body.

Aug 13, 2024 · Many forms of heart disease can be prevented or treated with healthy lifestyle choices. Heart disease symptoms depend on the type of heart disease. Coronary artery …

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.

Jan 8, 2025 · Learn about the heart's anatomy, how it functions, blood flow through the heart and lungs, its location, artery appearance, and how it beats.

The heart and blood vessels constitute the cardiovascular (circulatory) system. The heart pumps blood to the lungs so the blood can pick up oxygen, and then pumps oxygen-rich blood to the …

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 …

Mar 24, 2022 · 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 …

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 …