Intercalated disc / communication junctions in myocardium allow the cells to contract as a unit....

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Intercalated disc / communication junctions in myocardium allow the cells to contract as a unit. It means :
(a) When a cell receives a signal to contract, its neighbours are stimulated to contract.
(b) All myocardial fibres of heart contract at the same time.
(c) Only a single myocardial cell contract.
(d) Contractile stimuli cannot cross from one cell to another.
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