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Red blood cells (RBCs), or erythrocytes, have a biconcave disc shape that increases their surface area for efficient gas exchange. They contain hemoglobin, a protein that binds oxygen in the lungs and releases it in tissues, and they lack a nucleus and organelles, allowing more space for hemoglobin. RBCs are flexible, enabling them to navigate through narrow capillaries. Their primary function is to transport oxygen from the lungs to the body and return carbon dioxide for exhalation.

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5d ago

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