Respiratory Physiology Flashcards
What law is this: pressure is inversely proportional to volume for an ideal gas.
Boyles law
In V/Q mismatch with a high number what does this mean & what term is used to describe it.
Ventilation (V) is high but perfusion (Q) is low - “dead space” e.g in the trachea where there is no perfusion but lots of O2. Also in P.E. when an area of lung tissue is no longer perfused due to a clot, but is still well ventilated.
Physiologically what is the biggest cause of hypoxaemia (low blood 02)
V/Q mismatch
In V/Q mismatch with a low number what does this mean & what term is used to describe it.
Ventilation is low but perfusion is ok - “shunt”. e.g. collapsed lung, damage to epith of alveoli etc.
Where in the is perfusion greatest
the base (15x the apex)
Where in the lung is perfusion least
the apex (1/15 of the base)
What law states that rate of diffusion is proportional to area, thickness of membrane, and pp of gas
Fick’s law
Exercise increases: ventilation, perfusion or both
Both
The transport of O2 between alveoli and blood, and blood & tissues is via convection or diffusion?
Diffusion
O2 is transported in the blood around the body via convection or diffusion?
Convection
What is normal tidal volume of the lung
500ml
Which equation measures vol of lung that does not eliminate CO2 - physiological dead space (sum of alveolar and anatomical dead space)
Bohr’s equation
This equation measures the vol of the conducting airways = anatomical dead space
Fowlers method
The name of the law describing flow through airways.
Darcy’s law
The types of air flow at the trachea, bronchi and bronchioles respectively:
Turbulent, transitional, laminar (as overall resistance reduces as you get further into the alveoli part of lung)
