affecter of stroke volume
preload
how much they filling
how much blood filled the ventricle ( if you have more blood in the ventricle )
stroke volume)( positive effective on stroke volume )
if you increase stroke volume - you will increase cardiac output
how hard the heart pump
the contractility - positive effective on stroke volume => increase on cardic output
after load => how much pressure overcome to
force - blowing through a straw
blow
resistance
how much pressure you have to overcome
a negative impact on stroke volume
the more difficult
the lower the stroke volume
decrease the cardiac output
blood comein the heart
- -superior vena cava
- inferior vena cava
how much blood return to the heart ( to the vena cava )
more blood coming back to the vena cava
preload ( positive effect on cardiac output )
how much ventricle starched
much more inflated
pre load on ventricle
the harder we received
the force contract to the heart
higher cardiac output
if you cardiac muscle
rubber ben
the further you stretch rubber ben
end to end
another factor
preload
the greater
increase contractility
after load - pressure require to contract into the aorta
nice and wide -skinnner
resistant
easier
squeeze
smaller diameter to the larger
lower resistance -lower after load
smaller diameter - greater resistance
lab
aortic stenosis
the valve is more narrow
difficult to pump out
stroke volume
calculate stroke volume
how much blood actually need by body
left the heart
end of ventricular diastole- how full is the ventricle before contraction
substract the systolic volume
