Cardiac and smooth muscle differ from skeletal muscle in that: (Lectures: cardiac muscle, smooth muscle, summary exercise)

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Skeletal muscle fibres are never coupled via gap
junctions.

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Cardiac and smooth muscle are under voluntary control.

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They do not require an influx of Ca 2+  from the extracellular fluid to initiate contraction.

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Each individual cardiac/smooth muscle cell has its own nerve supply.

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Cardiac and smooth muscle contract more quickly.

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