T h e r a t e a n d d e p t h o f b r e a t h i n g a r e i n f l u e n c e d b y
c e n t r a l a n d p e r i p h e r a l c h e m o r e c e p t o r s t h r o u g h n e g a t i v e f e e d b a c k •
F ig u r e 1 3 . 8
Central chemoreceptors
in the medulla monitor
pH and PCO
of the CSF
and feed back to the
respiratory center.
Peripheral
chemoreceptors in the
carotid bodies and
aortic arch monitor pH,
P
o
2, and P
co
2 of the
blood and feed back to
the respiratory center.
Medulla
oblongata
Carotid
body
Common
carotid artery
Put It Togetheiy
As a result of a car accident in New York City, Jim
experienced head trauma. His cranial nerve X was damaged. Which
of the following would describe his response to a flight to Denver?
a. Jim would experience higher oxygen intake.
b. Jim would likely faint due to insufficient oxygen
c. Jim would not be affected in any way.
The Brain Controls Breathing 389
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