What is the function of red blood cells?
Answer and explanation
Correct answer: A. They carry oxygen from the lungs to the tissues, bound to haemoglobin
- Step 1: Red blood cells contain haemoglobin, a protein that binds oxygen. Step 2. They have no nucleus, which gives more room for haemoglobin, and a biconcave shape. Answer: carrying oxygen. Why not the others: Infection is fought by white blood cells, clotting uses platelets and fibrin, and hormones travel in the plasma.
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