What are the thickened areas of the sarcolemma of myocardial cells that enable electrical impuls-es to travel in a continuous cell-to-cell fashion called?
a. Myosins
b. Intercalated disks
c. Troponin Ts
d. I bands
ANS: B
Intercalated disks allow electrical impulses to be transmitted rapidly from cardiac fiber to cardiac fiber because the network of fibers is connected at these disks. Myosins do not play a role in conduction. Troponin Ts are involved in contraction but are not part of the sarcolemma. I bands are a part of the filaments bud, which do not conduct impulses in a cell-to-cell fashion.
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