control of breathing Flashcards
where are the areas of the brain that control breathing
pons and medulla
what does the pons control?
pneumotaxic centre sends inhibitory signals to ventral and dorsal resp groups in the medulla
what part of the brain is responsible for inspriation at rest
dorsal resp. group
what nerve innervates the diaphragm
phrenic
where are the dorsal and ventral resp. groups
medulla
where are chemoreceptors
carotid body
aorta
brain
what do chemoreceptors detect
O2 and H+
what is sO2
oxygen saturdation - ie percentage of Hb binding sites occupied
what is pO2
partial pressure - how much O2 is dissolved in blood
what percentage of O2 is at Hb binding sites and how much is dissolved in blood
98%,
2%
what is low oxygen in blood alled
hypoxaemia
what is low oxygen in tissues called
hypoxia
what does pulse oximeter measure
SpO2
