Cardiac muscle fibers differ from skeletal muscle fibers in that only the
a. cardiac fibers can contract without neural stimulation.
b. skeletal fibers are striated.
c. cardiac fibers contain glycogen.
d. skeletal fibers are connected electrically.
e. cardiac fibers are arranged in motor units.
A; Cardiac muscle fibers have an inherent rate of depolarization, and communicate with other fibers to coordinate the contraction. These fibers, unlike skeletal muscle fibers, are electrically coupled (choice d). Both types are striated (choice b). Skeletal muscles contain glycogen and are innervated in motor units (choices c and e).
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