Receptors associated with the aortic arch and carotid artery can recognize the changes in $A$ and $H^{+}$ concentration and send necessary signals to the $B$ for remedial actions. Select the right choice for $A$ and $B$ to complete the given $NCERT$ statement.

  • A
    $A - H^{-}; B - \text{rhythm centre}$
  • B
    $A - O_{2}; B - \text{rhythm centre}$
  • C
    $A - CO_{2}; B - \text{rhythm centre}$
  • D
    $A - \text{blood circulation}; B - \text{rhythm}$

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