A. Stroma
B. Myofilaments
C. Flana
D. Intercalted discs
Answer: D. Intercalted discs
Intercalated discs refer to the physical formations situated just flanked by the myocardial cells of the heart. They aid in bonding cardiac muscle cells together and also for transmission of sensory signals between cells. These structures are needed for a well-coordinated reduction of muscles in the heart. Intercalated cells are the chief reasons heart muscle cells will not separate.