2 天之前 · 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 …

In humans, the heart is approximately the size of a closed fist and is located between the lungs, in the middle compartment of the chest, called the mediastinum. [4]

2024年1月26日 · Your heart is the main organ of your cardiovascular system, a network of blood vessels that pumps blood throughout your body.

2024年8月22日 · 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.

2022年3月24日 · 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 …

2025年1月8日 · Learn about the heart's anatomy, how it functions, blood flow through the heart and lungs, its location, artery appearance, and how it beats.

2026年5月6日 · Here, learn about the structure of the heart, what each part does, and how it works to support the body. We also explore the electrical impulses and the role of CPR.