Which of the following is a characteristic feature of cardiac muscle?
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a
Fusiform cells that do not show striations
b
Communication junctions allow the cells to contract as a unit
c
Unbranched muscle fibres are bundled together in a parallel fashion
d
Its activity can be consciously controlled by us
answer is B.
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Detailed Solution
Communication junctions (intercalated discs) at some fusion points allow the cells to contract as a unit, i.e., when one cell receives a signal to contract, the neighbouring cells are also stimulated to contract (functional syncytium).