Pre-Veterinary Small Animal Practice Test

Which cells carry oxygen in the body using hemoglobin?

Platelets Plasma White blood cells Red blood cells

Correct Answer:

Red blood cells

Explanation:

Oxygen transport in the bloodstream is carried by hemoglobin within red blood cells. Hemoglobin binds oxygen in the lungs and releases it to tissues where it’s needed, using the iron-containing heme groups to carry up to four oxygen molecules per hemoglobin molecule. Plasma carries only dissolved oxygen and is not the primary transport method, while platelets and white blood cells perform clotting and immune functions, not oxygen transport.

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