The newly oxygen-rich blood (shown in red) returns to the heart and enters the left atrium. Blood flows through the left atrium into the left ventricle. The left ventricle pumps the oxygen-rich ...

It opens due to a build-up of pressure in the right atrium, and prevents back flow ... blood is carried to the heart from the lungs in the pulmonary vein. It goes into the left atrium, through ...

This clip is an introduction to the human heart. We find out about its location within the body and its function as a pump. The heart sits within the chest cavity between the lungs and is about ...

New research shows that women who hit menopause later in life have healthier blood vessels and mitochondria and a different composition of metabolites in their blood than those who stop menstruating ...

Blood flows through the heart and around the body in one direction. The four heart valves – pulmonary and tricuspid on the ...

Originally appeared on the NOVA Web site Cut to the Heart. Let's get straight to the heart of the matter—the heart's job is to move blood. Day and night, the muscles of your heart contract and ...