Human physiology (transport of gases): Name the protein that carries oxygen in the blood. Full question: Oxygen in our blood is primarily transported bound to which protein molecule? Choose the correct option.

Difficulty: Easy

Hemoglobin
Myoglobin
Albumin
Fibrinogen
Transferrin

Correct Answer: Hemoglobin

Explanation:

Concept
Hemoglobin, a heme-containing tetramer in red blood cells, reversibly binds O₂ in the lungs and releases it in tissues. Myoglobin stores O₂ in muscle but is not the main blood transporter; albumin and fibrinogen serve other roles.

Key relation
Hb + O₂ ⇌ HbO₂ (oxyhemoglobin)

Final Answer
Hemoglobin.

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