Share A&P circulatory system set c
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What serves as a muscular pumping device for distributing blood to all parts of the body?
heart
what is it called when the heart contracts?
systole
what is it called when the heart relaxes?
diastole
when the heart beats, what contracts first?
atria
what is it called when the atria contracts?
atrial systole
what does atrial systole do?
forces blood into the ventricles (through AV valces)
once filled, what do the ventricles do?
contract
what is it called when the ventricles contract?
ventricular systole
what does ventricular systole do?
forces blood out of the heart (through SL valves)
what do the AV and SL valves do?
controls the direction of blood flow
what 2 "r" words describe how the heart sounds?
rhythmical and repetitive
what is the "lub" sound caused by?
the closure of AV valves
When the AV valves close what is it preventing?
blood from rushing back into the atria during ventricular contraction
the "dub" sound is caused by...
the closure of the SL valves
what does the closure of the SL valve prevent?
blood from rushing back into the ventricles
the heart acts as how many separate pumps
2
