THE RESPIRATORY SYSTEM. VENTILATION & RESPIRATION. VENTILATION. Ventilation = Breathing – NO gas exchange. Inspiration & Expiration Steps. Diaphragm contracts & lowers. Intercostals contract & lift ribs. Lungs expand. Increased volume in lungs = decreased pressure in lungs.
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THE RESPIRATORY SYSTEM
VENTILATION & RESPIRATION
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Hb + O2 HbO2
☆ Respiratory Rates are VERY susceptible to levels of CO2 in the blood: too high = too acidic – body response = increased breathing
☆ Lung Cancer = #1 cause of cancer death in U.S. & >90% of all cases are b/c of smoking!
☆ #1 infectious disease killer in world
☆ > 2 billion infected & becoming resistant to meds!