2A cardiac cycle Flashcards
what is the cardiac cycle
the complex coordinated sequence of mechanical and electrical events that repeats with every heartbeat
how long does each cardiac cycle last
0.8 second
systole
period of contraction and emptying
diastole
period of relaxation atrial and ventricular
stroke volume
the blood pumped out of either ventricle per beat
heart beat
number of times heart beats per minute (about 73 to 230 bbm
cardiac outbput
quantity of blood pumped by either ventricle per munute
what is the normal cardiac output
at rest- 5L/min; maximun 20-25L/min
relationship between cardiac output, heart rate, and stroke volume
HR x SV = CO
venous return
quantity of blood returned to the heart per minute (Normally matches cardiac output)
end diastolic volume
quantity of book remaining in either ventricle at the end of ventricular diastole
end systolic volume
quantity of book remaining in either ventricle at the end of ventricular systole
wiggers diagram
slides 8-end- go study
by the time the atria contract (atria systole), what amount of blood is added to the ventricles
only 10-15% of blood volume
at what point does the first heart sound occur
when the LAP<the LVP
