HEARTBEAT
➤The alternating relaxations and contractions make up the cardiac cycle and one
complete cardiac cycle makes one heartbeat.and in other words, one complete pulsation
of the heart is called heartbeat. It is the complete regular movement movement of our
heart as it passes blood around your body.
STEPS OF CARDIAC CYCLE
➤Complete cardiac cycle consist of the following steps.
CARDIAC DIASTOLE
➤Atria and ventricles relax and blood is filled in atria. this period is called cardiac
diastole. In short, it is the period of relaxation of heart muscles.In one complete heartbeat,
diastole lasts about 0.4 seconds.
ATRIAL SYSTOLE
➤It is the last phase in diastole during which the ventricular filling is competed.
Immediately after their filling, both atria contracts and pump blood towards ventricles.
This period in cardiac cycle is called atrial systole.In one heartbeat, atrial systole takes
about 0.1 seconds.
VENTRICULAR SYSTOLE
In this period, both ventricles contract and pump blood towards body and lungs. The
period of ventricular contraction is called ventricular systole. In one complete heartbeat,
the ventricular systole lasts about 0.3 seconds.
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| HUMAN HEART |
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