This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Smooth Muscle: Contraction and Excitation, Subject name: Physiology
[{'content': 'Intercalated discs are present in? \nSelect and explain. \nA. Smooth muscle cell, B. Skeletal muscle cell, C. Cardiac myocytes, D. Hone', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ANSWER: (C) Cardiac myocytesREF: Ganong\'s 22nd ed p. 78"Cardiac muscle consists of single heart musde ceils (cardiomyocy tes) which have to be connected by intercalated discs to work as a functional organ"MUSCLE CELLS TYPES SkeletalCardiacSmoothNucleiMultinucleated, peripherally locatedSingle nuclei, Centrally locatedSingle nuclei. Centrally locatedBandingActin and myosin form distinctive bandsActin and myosin form distinctive bandsActin and myosin; No distinctive bandsZ-disksPresentPresentAbsent, cytoplasmic dense bodies are presentT tubulesT tubules at A-I junction; triads presentT tubules at Z disk; diads presentNo T tubules; no triadsCellular junctionsNo junctional complexesIntercalated disksGap junctionsNeuromuscularjunctionsPresentNot present; contraction is intrinsicNot present; contraction is intrinsic, neural, or hormonalCa+ bindingTroponinTroponinCalmodulinRegenerationLimited; satellite cellsNoneHigh', 'role': 'assistant'}]