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Membrane potential is the difference in concentratons of ions in cells
Myocyte is the name for a muscle cell, it is made of sarcomeres, the sarcomeres have a wall(actin filament) and head, the head clasps onto the wall causing muscle contraction.
Ions of Na and K begin to flow through the channels which causes the concentration gradients to switch and locks the head to the actin thus successful lock and contraction.
The contraction is caused when calcium comes in from the vesicles of the axon terminal(head) and removes the tropomyosine that was blocking the flow of ions