Ace the Phlebotomy Tech Challenge 2026 – Stick It to the Test and Succeed!

The right side of the heart sends blood to the lungs because it is responsible for receiving oxygen-poor blood from the rest of the body and pumping it to the lungs to be filled with oxygen. The left side of the heart is responsible for pumping the oxygen-rich blood back to the rest of the body. The terms "upper" and "lower" may refer to the atria and ventricles of the heart, but these are not directly responsible for sending blood to the lungs. Therefore, they are incorrect options.