When blood returns to the heart, it follows a complicated pathway. If you were in the bloodstream ... flows from the body into the right atrium. Blood flows through the right atrium into the ...

This means that a red blood cell will travel through the heart twice during a complete circulation around the body.

This is called systemic circulation. Oxygenated blood is carried to the heart from the lungs in the pulmonary vein. It goes into the left atrium, through the bicuspid valve and into the left ...

When blood returns to the heart, it follows a complicated pathway. If you were in the bloodstream ... flows from the body into the right atrium. Blood flows through the right atrium into the ...