What role does myoglobin play in the cycle of hemoglobin from lungs to tissues?

• A. Myoglobin releases hydrogen ions in tissues.
• B. Myoglobin facilitates oxygen diffusion into tissues.
• C. Myoglobin has no role in hemoglobin's cycle.
• D. Myoglobin binds CO2 in the lungs.

Answer: (B)