Please fill in the blank completing the sentences with the correct structures.

Deoxygenated blood comes from the upper and lower body and enters the heart through the __________, into the __________. Once this chamber fills with blood, it opens the __________, allowing blood to flow into the __________. Once this chamber fills with blood, it opens the __________. This will split into the right and left __________, leading to the lungs for reoxygenation. Once the blood has been reoxygenated, it returns to the heart via the __________. Once this chamber fills with oxygenated blood, it opens the __________, entering the heart at the __________, also known as the __________. Once this chamber fills with blood, it opens the __________, allowing blood to enter the __________, which pushes oxygenated blood back to the body.