Physiology: neural control of respiration Flashcards
what is The Rhythm of breathing
inspiration followed by expiration
what part of the brain is the major rhythm generator
the medulla
what is the name of the network of neurons believed to generate the breathing rhythm
the Pre-Botzinger complex
what gives rise to inspiration
the Rhythm excites inspiratory neurons(dorsal) in the medulla which fire leading to contraction of inspiratory muscles
what is passive expiration caused by
when firing of inspiratory neurons stops
what gives rise to active expiration
increased firing of dorsal(inspiratory) neurones triggers Ventral neurons to fire which excites internal intercostal + abdominal muscles(forceful expiration)
what part of the brain can modify respiration
the Pons
what does stimualtion of the Pneumotaxic centre(PC) in the Pons do
terminates inspiration
when is the PC stimulated
when dorsal(inspiratory) neurons fire
describe happens to respiration without the PC, and what this is called
breathing is prolonged inspiratory gasps with brief expiration
called Apneusis
give some examples of involuntary modifications of breathing (3)
joint receptors reflex in exercise
pulmonary stretch receptors
cough reflex
what do impulses from the Apneustic Centre in the Pons do
excite inspiratory area of medulla and prolong inspiration
