Which of the following factors shift the $HbO_2$ dissociation curve to the right?

  • A
    $(a)$ Increase in $PCO_2$
  • B
    $(b)$ Decrease in temperature
  • C
    $(c)$ Increase in $H^+$ (decrease in $pH$)
  • D
    $(d)$ Decrease in $2,3-DPG$ (diphosphoglyceric acid)

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What is true about $RBCs$ in humans?

The following statements refer to the transportation of gases. Read them carefully and choose the correct option containing the incorrect statements.
$(i)$ After leaving the lungs, each litre of blood contains about $20 \ ml$ of oxygen.
$(ii)$ When $PCO_2$ rises, the affinity of haemoglobin for oxygen is increased.
$(iii)$ Each litre of arterial blood contains about $4 \ ml$ of $CO_2$.
$(iv)$ The role of oxygen in the regulation of respiratory rhythm is quite significant.

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