3 breathing Flashcards
What is the respiratory quotient?
V(CO2) / V(O2)
In what areas is there convection of O2?
bifurcations 1-16 (bronchi - bronchioles - terminal bronchioles)
In what areas is there diffusion of O2?
17-23 (respiratory bronchioles, alveolar ducts, alveolar sacs
How does gas speed change when area increases?
It decreases
Flow = u x A
What is barometric pressure at sea level and at 5450m above sea level?
100kPa
50kPa
How does barometric pressure decrease with increased height?
decreases exponentially
What it the total pressure of the system equal to?
Dalton’s law;
the sum of the partial pressures of the gases in the system,
therefore partial pressure of a gas = fractional concentration of a gas x total pressure
What is physiological dead space equal to?
alveolar dead space + anatomical dead space
What is an example of anatomical dead space?
the conducting zone
What happens to alveolar ventilation when physiological dead space increases?
it decreases
What is minute ventilation?
total ventilation
volume of gas breathed out in one minute
expiratory flow = total volume x frequency
What is the problem with minute volume?
anatomical dead space means that not all the ventilation reaches the respiratory zone, so we use alveolar ventialtion istead
what is the formula for alveolar ventilation?
alveolar ventilation = (V(T) - V(D)) x f
