alt ctri sonal use only, do not reproduce. Vena Cava - there are two of these vessels or vena cavae which both lead into the right atrium. Where does the blood they carry come from? Pulmonary Veins...

Extracted text: alt ctri sonal use only, do not reproduce. Vena Cava - there are two of these vessels or vena cavae which both lead into the right atrium. Where does the blood they carry come from? Pulmonary Veins there are four of these vessels entering the left atrium. Where does the blood they carry come from? Is the blood in the pulmonary veins rich or poor in oxygen? do not reproduce QUmat.com Coronary vessels - these supply the heart with a blood supply of its own.