Discussion
Assertion (A): Heart muscle contracts as a coordinated unit rather than cell by cell.
Reason (R): Gap junctions let the signal pass directly between adjacent muscle cells.
Answer: A
Both are true and the reason gives the mechanism: direct cytoplasmic continuity spreads the depolarisation far faster than any released signal could, so the tissue behaves electrically as though it were a single cell rather than millions of separate ones.
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