Labels:daily OCR: RIGHT ATRIUM "HERE ARE FOUR CHAMBERS inside your heart, twoof which are called atria (one IS an atrium) The upper right chamber IS called the right atrium and opens into lower cham ber. or ventricle. Oxygen -poor blood from the body enters the right atrium via large blood vessels called the vena cavas. The heart muscle then squeezes blood from the right atrium into the right ventricle From the ventricle, blood pumped to the lungs for oxygen. The blood flow the right side of the heart is kept completely separate from thatof the left. ygen that
