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Question

Which of the following is true about cardiac muscle cells?

A
They lack an orderly arrangement of actin and myosin filaments
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B
They have less extensive sarcoplasmic reticulum and thus contract more slowly than smooth muscle.
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C
They are connected by intercalated discs, through which action potentials spread to all cells in the heart.
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D
They have a relatively low sodium permeability with resting potentials more positive than an action potential threshold
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Solution

The correct option is C They are connected by intercalated discs, through which action potentials spread to all cells in the heart.
  • Each cardiac muscle has a single centrally located nucleus.
  • Cardiac muscle cells are striated due to a similar arrangement of contractile proteins.
  • They mainly function in the pumping of oxygen-rich blood throughout the body to provide cells with vital nutrients.
  • So, the correct option is 'They are connected by intercalated discs, through which action potential spread to all cells in the heart'.

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