The respiration center,which can moderate the functions of the respiratory rhythm center,is located in

The respiratory centre in the brain which controls inspiration and expiration is situated in

Respiration mechanism is controlled by

When carbon dioxide concentration in blood increases, breathing becomes

Select the correct statement regarding the respiratory rhythm centers.

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.