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Respiratory Centers
Medulla oblongata

Has inspiratory and expiratory control centers

Pons

Apneustic center and pneumotaxic center . Limits the duration of inspiration , but ____________________ resp rate .

Chemical control of Respiration :

Via chemoreceptors in chemosensitive areas in M . O . , which are excited by ____________________ ____________________ and hydrogen and the peripheral chemoreceptors in the cartid and aortic bodies which are particularly sensitive to ____________________ .

Respiration is stimulated by an increase in ____________________ , H . , high PO2 .

Respiration is inhibited by a decrease in ____________________ , H , high PO2 .

In metabolic alkalosis ( vomiting ) the hydrogen concentration is lowered , respiration is inhibited which causes an increase in the PCO2 and thus increases the blood ____________________ concentration .

Hyperventilation causes respiratory ____________________ : low hydrogen concentration since there is a low PCO2 .

Rebreathing ____________________ air increases PCO2 and returns the blood Ph to normal .

( PAPER BAG )

Respiratory acidosis

Low pH of blood due to ____________________

CO2 not blown off

CO2 rises , ph goes down

Breathing fast - - - PCO2 goes down - - - - Hydrogen goes down - - - ____________________
Breathing slow - - - PCO2 goes UP - - - - - - - Hydrogen goes UP - - - - - ____________________