gas exchange Flashcards
what is normal paO2
13.3 kPa
what is normal paCO2
5kPa
what is normal paCO2
5kPa
what is normal pvO2 and pvCO2
6kPa
what is normal pvO2 and pvCO2
6kPa
what is diffusion rate proportional and inversely proportional to
P: pp gradient, solubility of gas, surface area
IP: thickness of membrane
which gas is more soluble - CO2 or O2
CO2 -
is solubility or molecular weight more important in diffusion - how much
solubility. Only square root of mol. weight matters so much less important
what happens to O2 as it diffuses into the capillary down its pp gradient
taken up by haemoglobin so pp stays low
are bound gases involved in pp gradient
no
when does disease pulmonary manifest first - why
at exercise - plenty of extra capacity at rest. disease at rest once it progresses
what are the letters for ventilation and perfusion
V and Q (WHY???)
what is normal V:Q at rest
0.8
why can’t other alveoli hyperventilate enough to make up for poorly ventilated ones
only works until haemoglobin is saturated. can’t compensate enough
what is a classic sign of pulmonary embollism
low CO2 due to hyperventilation - O2 can be low/normal
