AP BIOLOGY

Detailed explanation-1: -Oxygen-poor blood returns from the body to the heart through the superior vena cava (SVC) and inferior vena cava (IVC), the two main veins that bring blood back to the heart. The oxygen-poor blood enters the right atrium (RA), or the right upper chamber of the heart.

Detailed explanation-2: -Generally, veins carry deoxygenated blood from the body to the heart, where it can be sent to the lungs. The exception is the network of pulmonary veins, which take oxygenated blood from the lungs to the heart.

Detailed explanation-3: -Do all veins carry oxygen poor blood? No, the pulmonary veins carry oxygen rich blood and the pulmonary arteries carry oxygen poor blood.

Detailed explanation-4: -Veins carry blood back toward your heart. Capillaries, the smallest blood vessels, connect arteries and veins.

Detailed explanation-5: -The pulmonary veins carry oxygenated blood from the lungs to the left atrium of the heart. Systemic veins carry low-oxygen blood from the body to the right atrium of the heart.