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Human RBC live only for about 120 days. Which of the following statement(s) is/are most appropriate explanation for this feature?
(a)   Their plasma membranes undergo wear and tear as they squeeze through blood capillaries.
(b)   They respire anaerobically because they lack mitochondria.
(c)   They cannot synthesize new components to replace damaged ones because they lack a nucleus and other organelles.
(d)   They contain a very high concentration of the enzyme carbonic anhydrase.

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Only (a)

(a), (c) and (d)

Only (b)

(a) and (c)

answer is D.

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Detailed Solution

The lifespan of RBCs is 120 days. It can be corelated with the facts that they undergo lot of wear and tear and that damaged organelles are not repairable.

Anaerobic respiration and presence of carbonic anhydrase are irrelevant to short life span of RBC.

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