The picture shows a group of muscle cells in the heart. all of these muscle cells beat in unison to push blood in timing with the rhythm of the heart, at the direction of nearby nerve cells.
these muscle cells could best be called a
a) organ.
b) tissue.
c) macromolecule.
d) organ system.
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The picture shows a group of muscle cells in the heart. all of these muscle cells beat in unison to...
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