Biology, 02.10.2019 01:00 lakiethalucas
With each heartbeat, the muscle cells coordinate themselves so that each contraction is forceful enough to circulate blood through the entire body. the beat begins in the node, which sets the tempo of each beat, thus giving it the name of pacemaker. sinoatrial pericardium atrioventricular electrocardiogram semilunar
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With each heartbeat, the muscle cells coordinate themselves so that each contraction is forceful eno...
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