In humans, which oxygen-binding protein is found in red blood cells and is responsible for transporting oxygen in the blood?

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

Answer: (D)

Verified step by step guidance

1. Identify the function of each protein listed: Myoglobin, Collagen, Albumin, and Hemoglobin.
2. Recall that Myoglobin is an oxygen-binding protein primarily found in muscle tissue, where it stores oxygen rather than transports it.
3. Understand that Collagen is a structural protein found in connective tissues and does not bind or transport oxygen.
4. Recognize that Albumin is a plasma protein involved in maintaining osmotic pressure and transporting various substances, but it does not bind oxygen.
5. Conclude that Hemoglobin is the oxygen-binding protein located in red blood cells responsible for transporting oxygen throughout the bloodstream.