Heart Regulatory Cells
Name: sarah josephine uribe
Date: March 2004
What group of cells that adjusts the speed of heart beat?
The pace maker cells do it but any cardiac muscle cell can do it if the
pacemaker cells fail to do their job.
There is a patch of cells in the upper right atrium called the sinoatrial node. They "fire" an
action potential (bit of electricity) at a slightly faster rate than the rest of the cells around
them. This is why it is sometimes called the "pacemaker" of the heart, because it sets the pace of
the heartbeat. This wave of electricity then spreads from one cell to another throughout the atria
(left and right) then passes to another bunch of cells called the AV or atrioventricular node. The
atria then contract. Once the blood passes from the atria to the ventricles the wave of electricity
passes to the venticular cells and they contract forcing the blood out of the heart.
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Update: June 2012