Gap Junctions Are Made Up of Specific Proteins Called Connexin

Gap junctions are made up of specific proteins called connexin.If _______ muscle cells were unable to make connexin, then _______.

A) skeletal; the muscle fibers would be unable to contract
B) smooth; muscles of the gut would continue to work as usual
C) cardiac; the heart could not function normally
D) skeletal; one muscle fiber would still be able to transmit a contraction signal directly to a neighboring muscle fiber
E) smooth; one muscle fiber would still be able to transmit a contraction signal directly to a neighboring muscle fiber