Which statement about red blood cells is true?

Which statement about red blood cells is true?

• A. Carry oxygen to working muscles
• B. Defend against infection
• C. Clot blood
• D. Regulate blood pressure

Answer: (A)

Red blood cells are specialized for transporting oxygen. They carry oxygen from the lungs to tissues such as working muscles using haemoglobin, which binds oxygen in the lungs and releases it where it’s needed during exercise. Their biconcave shape increases surface area for fast gas exchange, and they lack nuclei and mitochondria to maximise space for haemoglobin. Defending against infection is the role of white blood cells, clotting is handled by platelets and clotting factors, and red blood cells don’t regulate blood pressure directly. So, red blood cells carrying oxygen to working muscles is the true statement.

Red blood cells are specialized for transporting oxygen. They carry oxygen from the lungs to tissues such as working muscles using haemoglobin, which binds oxygen in the lungs and releases it where it’s needed during exercise. Their biconcave shape increases surface area for fast gas exchange, and they lack nuclei and mitochondria to maximise space for haemoglobin. Defending against infection is the role of white blood cells, clotting is handled by platelets and clotting factors, and red blood cells don’t regulate blood pressure directly. So, red blood cells carrying oxygen to working muscles is the true statement.