Respiration mechanism is controlled by

The respiratory rhythm center is located in the .......

Rate of breathing is increased by

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?

The nerve impulses which stimulate the intercostal muscles and diaphragm and thus permit breathing, originate in the

$A$ chemosensitive area situated adjacent to the rhythm center is highly sensitive to which of the following ions?