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Question

RBCs are best adapted for carrying oxygen in blood because_____________.


A

RBCs are biconcave, circular and have a depression in the centre increasing their surface area.

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B

Old RBCs are destroyed everyday by the spleen and new ones are added from bone marrow.

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C

Mature RBCs do not use the oxygen they carry

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D

All the above

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Solution

The correct option is D

All the above


To accommodate maximum molecules of Haemoglobin, mature RBCs have no cell organelles, most importantly nucleus and mitochondria. They have nothing to dictate their repair as there is no nucleus and due to lack of mitochondria they cannot use the oxygen they carry. They are destroyed in the spleen as they get old or damaged. The average life cycle of an RBC is around 4 months or 120 days.


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