Final answer:
Intercalated discs in cardiac muscle contain gap junctions for ionic and electrical coupling, and desmosomes for structural integrity during contractions.
Step-by-step explanation:
The two types of cell junctions located in intercalated discs are gap junctions and desmosomes. Gap junctions allow the passage of ions and the depolarizing current produced by cations to flow from one cardiac muscle cell to the next, facilitating electric coupling and the transmission of action potentials necessary for the synchronized contraction of the heart muscle. Desmosomes, on the other hand, are cell structures that anchor the ends of cardiac muscle fibers together, preventing the cells from pulling apart during the stress of contraction, which is particularly important due to the strong forces exerted by cardiac muscle contractions.