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

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What product is created in body tissues when oxygen is released from oxyhemoglobin?

Carbon dioxide
Deoxygenated blood
Oxygenated blood
Biocarbonate

The correct answer is: Deoxygenated blood

When oxygen is released from oxyhemoglobin, the resulting product in body tissues is deoxygenated blood. Hemoglobin in red blood cells binds to oxygen in the lungs to form oxyhemoglobin, which transports oxygen to various tissues throughout the body. Upon reaching these tissues, the oxygen is released to be used by cells for cellular respiration, a process that produces energy. As the oxygen detaches from the hemoglobin, what remains is hemoglobin that is no longer bound to oxygen, thus forming deoxygenated blood. This deoxygenated blood is then returned to the lungs to be re-oxygenated. The other options do not accurately describe the process occurring after oxygen release. Carbon dioxide is a byproduct of cellular respiration, but it is not the immediate result of oxygen being released from hemoglobin. Oxygenated blood refers to blood that is rich in oxygen and does not apply to this scenario, as we are discussing the transition to deoxygenated blood. Bicarbonate is involved in the transport of carbon dioxide in the blood but does not directly result from oxyhemoglobin releasing oxygen in the tissues.