LectGasExchange4 - Control of Breathing Respiratory muscles...

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Control of Breathing • Respiratory muscles controlled via separate voluntary and involuntary neural pathways • Breathing rhythm generated within brain stem and transmitted to respiratory muscles • Inherent rhythmicity generated within medulla oblongata • Rhythmicity influenced by inputs from pons , hypothalamus, cortex and other areas
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Rhythm Generator • primary rhythm generator (collection of neurons in dorsal part of medulla ) is inspiratory pontine (pons) respiratory group: limits duration of inspiration (“off” switch) and adjusts sensitivity of dorsal respiratory group to various stimuli
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Excess CO 2 disturbs body pH Must get rid of it!
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Beathing Rhythm modified by Mechanoreceptors & Chemoreceptors Stretch receptors in smaller airways (bronchioles) of lung: stimulated by inflation – afferent impulses inhibit medullary and pontine centers terminate inspiration Hering-Breuer Reflex (stronger in newborn and non-human mammals) – response diminished by increasing CO 2
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This note was uploaded on 08/24/2011 for the course PCB 4723C taught by Professor Julian during the Fall '08 term at University of Florida.

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LectGasExchange4 - Control of Breathing Respiratory muscles...

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