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MCQ
Which statement about mature red blood cells in humans is correct?
Unit-5 Tissues Organs and Organ Systems
A They contain nuclei and mitochondria
B They are biconcave discs that lack nuclei at maturity
C They are mainly responsible for blood clotting
D They produce antibodies against pathogens
Explanation

Mature human red blood cells are biconcave discs without nuclei, which increases their surface area for oxygen transport.

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