resp phys Flashcards
things that decreasee compliance
o elastic fibres in lung parenchyma
o surface tension of water lining alveoli
Surfactant
Decreases surface tension
= INCREASES lung compliance
thing that determines airway resistance?
radius
thing that determines airway resistance?
radius
resistance is inversely proportional to radius
which airway has most resistance?
medium sized bronchi
o PO2
o PCO2
values?
o PO2=100 mmHg (partial pressure of oxy in alveoli is approx 100 mm of mercury)
o PCO2= 40 mmHg (in alveoli)
factors affecting rate of gas diffusion
partial pressure difference
surface area
thickness
diffusion coefficient of gas
hyperventilation
more carbon dioxide will be removed from the blood stream than the body can produce.
CO2 will decrease in alveoli, so more will go from bloood stream to alveoli.
wat determines whether poxy will bind to hemo or not
o HENCE Partial Pressure plays the most importnat role that determines whether oxy binds to hemo or not
carbon monoxide poisoning-shift
graph to left
FVC = forced vital capacity
The maximum amount of gas that can be expelled from maximum inspiration to maximum expiration
FEV1
forced expiratory volume in 1sec
Maximum volume of air that can be expelled from full inspiration in 1sec
ventilation
top: less
bottom: more
perfusion
top: MUCH less
bottom: MCUH more
Anaemia
will have decreased oxygen carrying capacity (low Hb) but normal saturation
