APK exam 3 Flashcards
what does diffusion-limited mean
transfer of gas depends on properties of gas and diffusion barrier
how fast is equilibrium for diffusion-limited
slow
what is perfusion limited
blood flow determines rate of transfer
what has the greatest influence on blood flow
resistance bc more pressure is needed to push the blood if there’s more/less resistance
what is blood flow determined by
viscosity, radius, length
does an obese person have more or less blood vessels
much more b/c more tissue = more vessels
does CO increase or decrease w/ intensity
increase
def systolic BP
pressure against arteries during systole
what factor of heart is impacted by # crossbridges
contractability
how is EDV related to contractility
directly
how is EDV related to SV
directly
how is EDV related to HR
indirectly
does hypertension cause an increase or decrease in SV
decrease
does hypertension cause an increase or decrease in afterload
increase
is pressure of CO2 lower or higher in arterial blood compared to venous blood
lower
what should someone with hypertension avoid
any high intensity or high weight exercise, especially upper body exercise
according to Fick’s law of diffusion what is inversely related to rate and SA
thickness
according to Fick’s law, are rate and SA inversely or directly related
directly
what’s the quickest way to decrease BP
lose weight
what are other ways to decrease BP
limit salt, alcohol, aerobically train @ steady state
do hypertensive pts need to be more careful with upper or lower body exercise
upper b/c blood vessels are smaller and will lead to quicker increase in BP
what is approximate BP during exercise for healthy individual
180/65
what does aerobically training to do SV
increase SV
what does aerobically training do to CO
increase
what are some local factors that increase blood pressure
increase temp, nitric oxide, adenosine, CO2, Mg, K
what is = preload
EDV
what’s the most important factor affecting venous return
pumping pressure of the heart
what does a greater surface area do to gas exchange
increase
what are some factors that increase CO
> catecholamines, >blood flow b/c increase strength of contraction
SV equation
EDV-ESV
def preload
amount of blood returned to left ventricle
what does greater aerobic ability do to preload
increases preload
def contractility
force of contraction