Start: Some oxygen in the lungs diffuses into the blood., Oxygen is transported in the blood to all parts of the body., Oxygen diffuses into the body cells., Oxygen is used by cells for respiration to release energy from glucose., Carbon dioxide and water are waste products of respiration., Carbon dioxide diffuses from the body cells into the blood., Carbon dioxide is transported back to the lungs., Carbon dioxide diffuses from the blood into the air sacs in the lungs..

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