Adult human RBCs are enucleate. Which of the following statement(s) i s / a r e most appropriate explanation…

Adult human RBCs are enucleate. Which of the following statement(s) is/are most appropriate explanation for this feature?
(i) They do not need to reproduce
(ii) They are somatic cells
(iii) They do not metabolize
(iv) All their internal space is available for oxygen transport
  1. Only (iv)
  2. Only (i)
  3. (i), (iii) and (iv)
  4. (ii) and (iii)

Solution

In most of the mammals including humans, RBCs are biconcave and are enucleated. Due to lack of nucleus and cell organelles, they provide more space for oxygen carrying pigment - Haemoglobin. They respire anaerobically due to the absence of mitochondria and do not use up the oxygen they carry. 

Asked in: NEET 2017

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