Where are the respiratory centers located in the brain?

Which of the following changes usually tends to occur in plain dwellers when they move to high altitudes?
$I.$ Increased breathing rate
$II.$ Increased $RBC$ production
$III.$ Increased $WBC$ production
$IV.$ Increased thrombocyte count
Choose the correct option.

When $CO_2$ concentration in blood increases,breathing becomes

Where is the respiratory rhythm center located?

In a state of fever,the respiratory rate.......

Which cranial nerve carries impulses to the expiratory centre in the medulla oblongata when stretch receptors are stimulated by the inflation of lungs to a critical level?