ANATOMY

Detailed explanation-1: -Blood rich in carbon dioxide then returns to the heart via the veins. From the heart, this blood is pumped to the lungs, where carbon dioxide passes into the alveoli to be exhaled.

Detailed explanation-2: -Red blood cells then travel within veins back to the right side of the heart. From the heart the blood is pumped back to the lungs where the carbon dioxide is released from the blood into the air sacs to be breathed out.

Detailed explanation-3: -Oxygen-poor blood from the body enters your heart through two large veins called the superior and inferior vena cava. The blood enters the heart’s right atrium and is pumped to your right ventricle, which in turn pumps the blood to your lungs.

Detailed explanation-4: -These are the main roles of the circulatory system. The heart, blood and blood vessels work together to service the cells of the body. Using the network of arteries, veins and capillaries, blood carries carbon dioxide to the lungs (for exhalation) and picks up oxygen.

Detailed explanation-5: -Veins take blood back to the heart, then to the lungs to get rid of carbon dioxide and pick up oxygen. Capillaries are tiny blood vessels that connect the arteries and veins.