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The normal red cell lasts approximately how many days before it is destroyed?

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The normal red cell lasts approximately how many days before it is destroyed?

(a) 240

(b) 10

(c) 12

(d) 120

I had been asked this question in examination.

My question is based upon Other Biomedical Recorders in division Biomedical Recorders of Biomedical Instrumentation

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Right choice is (d) 120

Explanation: The normal red cell lasts approximately 120 days before it is destroyed. There are about 5.5 million of them in every cubic millimetre of blood in men and nearly 5 million in women. In the whole body, there are about 25 billion erythrocytes and they are constantly being destroyed and replaced at a rate of about 9000 million per hour.

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