Where are the respiratory centers located in the brain?

The breathing centre initiates the ventilation in response to

The pneumotaxic centre of the brain can:

What is the effect on breathing when the concentration of $CO_2$ in the blood increases?

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.

In which part of the hindbrain is the pneumotaxic center present?