This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conducting System of Hea, Subject name: Physiology
Intercalated disc has all except: 
Select and explain. 
A. Zona occludens, B. Macula adherens, C. Fascia adherens, D. Gap junctions
A: Zona occludens
Answer: A: Zona occludens 
Explanation: Zona occludens = tight junction, Macula adherens = desmosome The intercalated disks are composed of a fascia adherens that is responsible for end-to-end cell anchoring of actin filaments to one another and no tight junctions are present. Between the myofibers, the macula adherens (or desmosome) binds the cells and is responsible for anchoring the intermediate filament cytoskeletal proteins, vimentin, and desmin. Gj = Gap junction; Ds = Desmosome; Fa = Fascia adherens