Q.

Which of the following is a characteristic feature of cardiac muscle? 

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a

Communication junctions allow the cardiac cells to contract as a unit.

b

Its activity can be consciously controlled by us.

c

Cardiac muscle fibres are fusiform cells which do not show striations.

d

Unbranched muscle fibres are bundled together in a parallel fashion.

answer is B.

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Detailed Solution

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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).

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