PHGY 210 Chapter Notes - Chapter 13.7-13.9: Ventral Respiratory Group, Dorsal Respiratory Group, Respiratory Alkalosis
18 Mar 2017
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If breathe in air with lower [c] of oxygen, ventilation doesn"t increase until arterial. Po2 reaches 60 mmhg: beyond this point, any further reduction causes large increase in ventilation, reflex is mediated by chemoreceptors. Control by pco2: even small increase in arteriolar pco2 causes significant increase in ventilation. Increase in concentrations of co2 have much larger impact than decrease in. **in healthy individuals, cardiac output is the limiting factor to exercise not ventilation: accumulation of h+ due lactic acid buildup in blood --> stimulates hyperventilation in part. Other ventilatory responses: protective reflexes: protect respiratory system from irritant materials, cough, sneeze (receptors in larynx and pharynx respectively, alcohol inhibits cough reflex, voluntary control of breathing: descending pathways from cortex to motor neurons of respiratory muscles. Inhibited when involuntary stimuli intense (pco2 or 1-h [c]: hyperventilation leads to decrease in alveolar & arterial pco2 and increase in.
