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 ...

The vessels that feed the heart are called coronary arteries (shown in the diagram right) and they branch off from ... When they’re wide open, blood flows through them easily. As we age, these pipes ...

Cut through the coracoid bar and pull back to fully open the pericardial cavity. Locate the vessels entering and leaving the heart and the 2 heart chambers - atrium and ventricle. Look at diagram of ...

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 ...

open as wide as it should, restricting blood flow through the heart - this means less blood reaches the body, pressure builds up and the lungs can swell with fluid close properly and allow blood ...

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 ...