Originally appeared on the NOVA Web site Cut to the Heart ... the steps below one by one. Oxygen-poor blood (shown in blue) flows from the body into the right atrium. Blood flows through the ...

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 ...

blood flows into the heart from a vein, goes into an atrium, then a ventricle, and out through an artery. The valves prevent the blood flowing backwards. The heart is relaxed and blood flows into ...

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 ...

Let's get straight to the heart of ... would follow the steps below one by one. Oxygen-poor blood (shown in blue) flows from the body into the right atrium. Blood flows through the right atrium ...