Question

RBCs had mitochondria. what would have happened?

Answer 1

If the RBCs had mitochondria ha present in them then the RBCs would use up the oxygen  absorbed and the oxygen would not go other organs of the body.

Answer 2

Most mitochondrial proteins are encoded by nuclear DNA, so a mitochondrion present in a cell without a nucleus (such as RBCs) would lack most of its primary functional and structural elements.
As a result, the redundant mitochondria would either:

be spotted and successfully destroyed via mitophagy (although I doubt such processes are possible in a highly specialized RBC)

continue to live on and reduce the oxygen carrying potential of the RBC by out-competing the cell for oxygen and taking up valuable space which would otherwise be used for packing in haemoglobin.


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