Cardiac Muscle Cells - CardiacMuscleCells...

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Cardiac Muscle Cells Skeletal Muscle Cells Elongated, branching cells (connecting w/ other cardiac  cells)  containing 1-2 centrally located nuclei (lesser amt) Contains actin and myosin myofilament ~ striated  appearance Striations less regularly arranged and less numerous than  skeletal muscles Intercalated disks: specialized cell-cell contacts Desmosomes (specialized plasma membranes) hold the cells  together Gap junctions: allow cytoplasm to flow freely btwn cells  low electrical resistance btwn cells    AP pass easily from  one cell to another Electrically, cardiac muscle of the atria and of the ventricles  behaves as single unit Not electrically isolated; connected, e=behaves as a single  unit (whole atria + whole ventricles = 2 units) ~ if one cell  sends and AP, it will affect all the other cells b/c of the links  btwn atria and ventricles (SA node has connections to all 
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This note was uploaded on 12/05/2011 for the course KINESIOLOG 1Y03/1YY3 taught by Professor Parises during the Spring '11 term at McMaster University.

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