Which of the following statement not true regarding regulation of respiration?

(i) A specialized center present in the medulla called respiratory rhythm center.

(ii) Another center present in the region pons of the brain called pneumotaxic center can moderate the functions of the respiratory rhythm center.

(iii) Neural signal from pneumotaxic center can increase the duration of inspiration and thereby alter the respiratory rate.

(iv) Receptors associated with aortic arch and carotid artery also can recognize changes in CO 2 and H + concentration in blood.

(v) A chemo sensitive area is situated adjacent to the rhythm center which is highly sensitive to O 2 and hydrogen ions.

(vi) The role of oxygen in the regulation of respiratory rhythm is quite significant.