Which Statement About the Vertebrate Heart Is True

Multiple Choice

Which statement about the vertebrate heart is true?

A) Intercalated discs are areas of physical weakness between adjacent cells.
B) Gap junctions provide strong mechanical adhesions between adjacent cells.
C) Pacemaker cells initiate the heartbeat and lack actin and myosin filaments.
D) Gap junctions electrically couple cardiac muscle cells.
E) The vertebrate heart is arrhythmic.