This document discusses the neural regulation of respiration. It describes the respiratory center located in the medulla oblongata and pons, including the dorsal and ventral respiratory groups and pneumotaxic center. It then discusses the chemical control of respiration, noting that excess carbon dioxide and hydrogen ions in the blood act on the respiratory center to increase breathing. Both direct chemical control via chemosensitive areas in the medulla and indirect control via peripheral chemoreceptors are described.