Muscles are soft tissues containing protein filaments namely actin and myosin that slide over one another. The major function of muscles is to bring about contraction by changing the length and shape of the muscles cells called sarcomeres. Skeletal, cardiac, and smooth muscles are the three major types of muscles.

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Chapter 4, Problem 21RQ

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Introduction: Muscles are soft tissues containing protein filaments namely actin and myosin that slide over one another. The major function of muscles is to bring about contraction by changing the length and shape of the muscles cells called sarcomeres. Skeletal, cardiac, and smooth muscles are the three major types of muscles.

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