AP BIOLOGY

Detailed explanation-1: -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.

Detailed explanation-2: -Deoxygenated blood is rich in carbon dioxide. The blood that comes from the body to the upper chamber on the right atrium is deoxygenated.

Detailed explanation-3: -Systemic Circuit The systemic circulation provides the functional blood supply to all body tissue. It carries oxygen and nutrients to the cells and picks up carbon dioxide and waste products.

Detailed explanation-4: -The pulmonary artery is a big artery that comes from the heart. It splits into two main branches, and brings blood from the heart to the lungs. At the lungs, the blood picks up oxygen and drops off carbon dioxide. The blood then returns to the heart through the pulmonary veins.

Detailed explanation-5: -Blood returning from the peripheral tissues to the heart has a relatively low concentration of oxygen, but is rich in carbon dioxide as a result of cellular metabolism. While oxygen only makes up 21% of inspired air, its concentration in deoxygenated blood is much lower.