Blood returning from the body enters the [BLANK-1] through t…
Blood returning from the body enters the through the . Blood passes through the into the . When the heart contracts, blood is pumped through the into the and out to the lungs. Oxygenated blood returns to the heart through the and enters the . It then flows through the into the . When the heart contracts, blood is ejected through the into the and distributed to the rest of the body.