What is the function of red blood cells?

What is the function of red blood cells?

• A. Carry oxygen and nutrients
• B. Healers, help fight diseases
• C. Regulate blood pressure
• D. Digest proteins

Answer: (A)

Red blood cells’ main job is to move gases through the blood: they pick up oxygen from the lungs and deliver it to every cell in the body, then carry carbon dioxide from the tissues back to the lungs to be exhaled. This gas transport is what defines their role in circulation. The option that describes carrying oxygen (and nutrients) fits this idea of transportation through the bloodstream, which is why it’s the best match. The other options point to functions of different blood components or processes—fighting infections is the realm of white blood cells, regulating blood pressure isn’t the primary job of red blood cells, and digesting proteins happens in the digestive system.

Red blood cells’ main job is to move gases through the blood: they pick up oxygen from the lungs and deliver it to every cell in the body, then carry carbon dioxide from the tissues back to the lungs to be exhaled. This gas transport is what defines their role in circulation. The option that describes carrying oxygen (and nutrients) fits this idea of transportation through the bloodstream, which is why it’s the best match. The other options point to functions of different blood components or processes—fighting infections is the realm of white blood cells, regulating blood pressure isn’t the primary job of red blood cells, and digesting proteins happens in the digestive system.