Which best describes the blood flowing in vein?

The blood flowing in a vein is typically deoxygenated, meaning it has a lower concentration of oxygen compared to oxygenated blood. Veins are responsible for carrying blood back to the heart from various tissues and organs throughout the body. As blood circulates through the body, oxygen is delivered to tissues and organs through arteries, and carbon dioxide is collected as a waste product. Deoxygenated blood is then transported back to the heart via veins, where it is pumped to the lungs for oxygenation and the cycle begins again.