What is the molecule in the erythrocyte that binds to oxygen?

• A. Albumin
• B. Fibrinogen
• C. Hemoglobin
• D. Myoglobin

Answer: (C)

Verified step by step guidance

1. Understand the role of erythrocytes (red blood cells) in the body, which is primarily to transport oxygen from the lungs to tissues and carbon dioxide from tissues back to the lungs.
2. Identify the key molecule responsible for oxygen transport in erythrocytes. This molecule is hemoglobin, a protein that binds oxygen.
3. Learn about the structure of hemoglobin, which consists of four subunits, each containing an iron atom that can bind to an oxygen molecule.
4. Explore the binding process: when hemoglobin binds to oxygen, it forms oxyhemoglobin, allowing efficient transport of oxygen through the bloodstream.
5. Differentiate hemoglobin from other proteins like albumin and fibrinogen, which have different functions in the body, such as maintaining osmotic pressure and blood clotting, respectively.