Equations Flashcards
Darcy’s Law
Mean arterial pressure
Pulse pressure
CO
SV
– F = P/R (Flow, Pressure diff., vascular resistance)
= diastolic pressure + 1/3 pulse pressure
= systolic pressure – diastolic pressure
= HR x SV
= EDV – ESV
Systemic BP
Starlings law
Net filtration pressure
Boyle’s law
= CO x TPR (total peripheral resistance)
energy of contraction is proportional to the initial length of the cardiac muscle fibre. (higher EDV = longer length of muscle fibres.)
= Net hydrostatic pressure (18-35mmHg) – Net osmotic pressure (25mmHg)
the pressure of a given quantity of gas is inversely proportional to it’s volume.
(increase volume, decreased pressure etc.)
Vital capacity (VC)
Inspiratory capacity (IC)
Functional residual capacity (FRC)
Total lung capacity (TLC)
= TV + IRV + ERV
= TV + IRV
= RV + ERV
= TV + IRV + ERV + RV
Pulmonary ventilation
Ventilation rate
Compliance
Laplace’s Law
= TV x breathing frequency
= TV x respiratory rate
= change in volume/change in pressure (litres/cmH20)
describes the relationship between Pressure (P), surface tension (T) and the radius of an alveolus. P = 2T/r
