BIOC32H3 Lecture Notes - Lecture 6: Cardiac Muscle Cell, Purkinje Fibers, Atrioventricular Node

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22 Oct 2016
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We discussed the heart and the cardiac cycle and the functioning of the valves. We discussed the structure of cardiac muscle- emphasis on intercalated discs, boundary between one cardiac muscle cell and the next. At the intercalated disc, we find two noteworthy structures- desomosomes. They link one cardiac muscle cell to the adjacent muscle cell. We don"t have the coming apart of cardiac muscle cells. They also permit the transmission of contractile force to one cardiac muscle cell to another. If one heart muscle cell is contracting, it takes the force of that contraction and applying it to an adjacent cell and pulling it towards it. We have this ability to transmit the contractile forces among these cells. We also have gap junctions, structures that allow for cytoplasmic connection between 2 adjacent muscle cells. These allow for ions to freely pass from one cardiac muscle cell to the next.

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