Which of these is a major difference between smooth muscle and skeletal muscle?

Question

Which of these is a major difference between smooth muscle and skeletal muscle? (Check all that apply)

Skeletal muscle usually exhibits spontaneous activity, while smooth muscle cannot contract spontaneously.

Only skeletal muscle requires increased calcium ion concentration in the cytosol for contraction.

Myosin is the main regulatory protein in skeletal muscle

Only skeletal muscle has both actin and myosin.

Myosin is the main regulatory protein in smooth muscle

Skeletal muscle usually exhibits spontaneous activity, while smooth muscle cannot contract spontaneously.

Only skeletal muscle requires increased calcium ion concentration in the cytosol for contraction.

Myosin is the main regulatory protein in skeletal muscle

Only skeletal muscle has both actin and myosin.

Myosin is the main regulatory protein in smooth muscle

Explanation / Answer

Skeletal muscles require Calcium ion concentration for contraction whereas smooth muscles require epinephrine for contraction. Also both skeletal muscles and smooth muscles come contain actin and myosin filaments.

Hence option (b) is correct.

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