OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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What happens to deoxygenated blood after it delivers oxygen to body cells?

It returns to the heart
It transforms into oxygenated blood
It is expelled from the body
It is absorbed by the digestive system

The correct answer is: It returns to the heart

After deoxygenated blood delivers oxygen to body cells, it returns to the heart. This process is crucial in the circulatory system. Once blood has released its oxygen to tissues, it becomes deoxygenated and is then collected by small veins, which converge into larger veins. These veins transport the deoxygenated blood back to the heart, specifically to the right atrium. From there, the blood will eventually be pumped to the lungs to release carbon dioxide and absorb fresh oxygen, completing the cycle of circulation. The other options suggest processes that do not accurately depict the journey of deoxygenated blood. The transformation into oxygenated blood occurs in the lungs, not in the body tissues. Expelling deoxygenated blood from the body is not a physiological process, as it must first return to the heart and lungs. Absorption by the digestive system is unrelated to the function of blood circulation and oxygen transport.