Parasympathetic – constrict
Sympathetic – dilator
In normal lungs, ΔV Lnly begins to fall off at high frequencies.
In lungs with a high τ, the ΔVLbegins to fall off even at fairly low respiratory frequencies.
Time constant – τ
About 2 seconds
Equal pressure point – airway pressure is same as interpleural pressure
Purse lips – increase resistance, increase pressure
Maintains more open airways during exhalation
At a VLof 5 liters, flow increases steadily as we increase effort.
Flow - V́ (liters/second)
Oxygen tension (partial pressure)
Oxygen hemoglobin dissociation curve
Oxygen carrying capacity (1.35 mL O /g2am Hb)
Oxygen content/total oxygen con