Question

multiple choice question branching cardiac muscle fibers are connected by _, which contain gap junctions and adhesion junctions. desmosomes tight junctions intercalated disks sticky proteins

Explanation:

Intercalated disks are the structures that connect branching cardiac - muscle fibers. They contain gap junctions that allow for electrical coupling and adhesion junctions that hold the cells together. Desmosomes are a type of adhesion junction but not the overall structure connecting cardiac muscle fibers. Tight junctions prevent the passage of substances between cells rather than connecting cardiac muscle fibers. Sticky proteins are not the specific structure for this connection.

Answer:

C. intercalated disks