Mechanical Activity Of The Heart Flashcards
The quantity of blood in the ventricle just prior to systole or after atrial systole
End diastolic volume
End diastolic volume
120-130 mL
Quantity of blood ejected during systole
Stroke volume
Quantity of blood ejected per minute
Cardiac output
Quantity of blood ejected per beat
Stroke volume
Average stroke volume
70-80 mL
Amount of blood remaining in the ventricle after ejection
End systolic volume
End systolic volume
50-70
Quantity of blood remaining in the ventricle after maximal systolic ejection
Residual volume
Volume of blood that can still be ejected; qty of blood remaining in the ventricle at the end of systolic volume-residual volume
Systolic reserve volume
Systolic reserve volume when ejected becomes part of the ______________.
Stroke volume
Potential volume increase which the heart can accommodate under normal physiological conditions; potential volume when venous return increases
Diastolic reserve volume
Cardiac output
5L ; stroke volume + heart rate
Cardiac index
3.2 L
Cardiac output per minute per sq. meter of body surface
Cardiac index
The maximum percentage that the cardiac output can increase above normal
Cardiac reserve
Percentage of end diastolic volume ejected
Ejection fraction
Volume of blood returning to the heart per unit time (per minute)
Venous return
Degree of tension on the muscle when it begins to contract
Preload
Load against which the muscle exerts its contractile force
Afterload
Preload
End diastolic pressure when the ventricle has become filled
Afterload
Pressure in the aorta leading from the ventricle; systolic pressure
Preload is the pressure during ____________________________
Filling of the ventricle
________________ ___________________ against which the ventricle mst contract is known as the afterload
Arterial pressure
