Which of the following statements are CORRECT ?
I. A specialized center present in the medulla region of the brain called respiratory rhythm center is primarily responsible for the regulation of respiration.
II. A Chemosensitive area is situated adjacent to the rhythm which is highly sensitive to `O_2,CO_2` and hydrogen ions .
III . Receptors associated with aortic arch and carotid artery also can recognize changes in `CO_2 and H^+` concentration and send necessary signals to the rhythm center for remedial actions.
IV The neural signal from the pneumatic center can increase the duration of inspiration and thereby alter the respiratory rate .

Options

A. I,III and IV
B. II,III and IV
C. I and III
D. I and II

Answer

C