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Human Atlas: How The Heart Works (2:14)
At the center of the circulatory system is the heart. This muscle, the size of a fist, keeps blood moving throughout the body. Learn more about the heart in this video.
Human Atlas: Conduction System (1:39)
Conduction system is the process that causes the heart muscles to expand and contract rhythmically. Learn more about the conduction system in this video.
Pumping Life: Cells and How the Body Works (1:58)
The human body is made of cells. All cells need nutrients and oxygen, and all produce waste.
Your Heart and Arteries (0:59)
Watch this video about your heart and arteries on HowStuffWorks. Scientists are searching for a gene that causes aneurysms, and what effect it may have on other areas of the heart. Learn about your heart in this video from ScienCentral.
Australian Girl Has Super Blood (1:41)
Transplant patients usually take anti-rejection drugs to stop their bodies from killing the new organ. Watch this Reuters video to see how Demi-Lee Brennan's "super blood" actually changed type, from O- to O+, to match her newly transplanted liver.
