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Ventilation
Normal Control of Breathing
Question | Answer |
---|---|
What 3 factors control normal breathing? | 1. Forebrain Activity; 2. Inflation Reflex; 3. Chemical control |
How is the Forebrain involved in normal control of breathing? | repiratory INHIBITION during Swallowing, Sneezing, Talking, Crying |
How is the Inflation Reflex involved in normal control of breathing? | Stretch Receptors in Bronchioles INHIBIT the Inspiratory Center via Vagus Nerve Afferents |
What is the significance of the Inflation Reflex? | 1. prevent Excessive Inflation; 2. only significant during Exercise |
What is the function of Oxygen Chemoreceptors? | depolarized by LOW blood O2 - Excitatory connections to the Inspiratory Center and CVC |
What is the function of Central Chemoreceptors? | depolarized by HIGH H+ --> ^ CSF pH --> excites Inspiratory Center |
What is the chemical formula for Central Chemoreceptors? | tissues --> CO2 + H2O <--> H2CO3 <--> HCO3- + H+ --> lungs |
What would be the result of an increase in breating? | increase breathing --> decrease CO2 & H2O --> decrease H2CO3 |
What would be the result of increased CO2? | ^ CO2 --> ^ H2CO3 --> ^ HCO3- + H+ |