Correct answer: The blue cells between the myocytes should be recognised as intercalated discs, which can only be found in cardiac muscle tissue. Intercalated discs are complex adhering structures which connect single cardiac myocytes to an electrochemical syncytium (in contrast to the skeletal muscle, which becomes a multicellular syncytium during mammalian embryonic development) and are mainly responsible for force transmission during muscle contraction. Intercalated discs also support the rapid spread of action potentials and the synchronized contraction of the myocardium.