How will you describe the blood passing through the lungs?

The blood passing through the lungs is deoxygenated, having returned from the body after delivering oxygen and collecting carbon dioxide. As it travels through the pulmonary arteries to the lungs, it enters the alveoli, where gas exchange occurs. Here, carbon dioxide is released and oxygen is absorbed into the bloodstream. This oxygenated blood then returns to the heart via the pulmonary veins, ready to be pumped to the rest of the body.