Which feature of a normal red blood cell helps it exchange gases efficiently?
Correct answer: A. A biconcave shape with a large surface area
- A. A biconcave shape with a large surface area
- B. A spherical shape with a central nucleus
- C. A rough surface with many cell organelles
- D. A thick wall containing contractile proteins
Explanation
The biconcave shape gives the red blood cell a large surface area and short diffusion distance for gas exchange. Mature red blood cells lack a nucleus and most organelles, allowing more space for haemoglobin.
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Blood and immunity covers plasma, red blood cells, white blood cells, platelets, haemoglobin, blood groups and haemostasis. It explains innate and adaptive defenses, antibodies, lymphocytes, inflammation, vaccination and immune memory, with a distinction between active and passive immunity and between antigen and antibody.
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