A functional syncytium
a. is a pair of antagonistic muscles causing a joint to move in opposite directions
b. is able to contract as a unit because action potentials move between adjacent cells through gap junctions
c. is a functional junction between a smooth muscle fiber and an autonomic nerve ending
d. is all of the above
e. is none of the above
B
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Fill in the blank(s) with the appropriate word(s).
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