[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 …

Oct 21, 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 …

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

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.

This animation features the heart and circulatory system and how they work. ...more Comments are turned off. Learn more

Dec 26, 2024 · Explore the heart anatomy with its parts, names & a clear diagram. Learn how the heart functions & its crucial role in the circulatory system

Oct 1, 2025 · Your heart is an essential organ in your body. It functions as a muscle that pumps blood nonstop and sends oxygen and nutrients to other organs.

Sep 3, 2025 · The anatomy of the human heart starts with understanding each of the four chambers. Learn about the upper, lower, right, and left parts of heart anatomy.

4 days ago · 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 …