EVERYDAY SCIENCE

Detailed explanation-1: -Using the network of arteries, veins and capillaries, blood carries carbon dioxide to the lungs (for exhalation) and picks up oxygen. From the small intestine, the blood gathers food nutrients and delivers them to every cell.

Detailed explanation-2: -Pulmonary artery is the only artery that carries carbon dioxide rich blood to lungs for re-oxygenation. Since pulmonary artery carries blood away from the heart, it is called artery and not a vein.

Detailed explanation-3: -Carbon dioxide moves from the cells and into the capillaries. Blood leaves the capillary and enters the small venules. These venules become progressively larger vessels called veins. The vena cava are the two largest veins that carry blood into the right upper chamber of the heart (the right atrium).

Detailed explanation-4: -Veins carry blood rich in carbon dioxide. This type of blood is also known as deoxygenated blood as all the oxygen from it has been transferred to the cells and the carbon dioxide released by the cells is absorbed into the blood.