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The Human Muscular System

The Human Muscular System. Types of Muscle. Cardiac Muscle Striated muscle found only in the heart Under involuntary control Only rests between contractions Smooth Muscle Lack striations Usually under involuntary control Contraction is slow and rhythmic Muscles of internal organs

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The Human Muscular System

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  1. The Human MuscularSystem

  2. Types of Muscle • Cardiac Muscle • Striated muscle found only in the heart • Under involuntary control • Only rests between contractions • Smooth Muscle • Lack striations • Usually under involuntary control • Contraction is slow and rhythmic • Muscles of internal organs • Skeletal Muscle • Striated muscle fibers with no clear separation between cells • Under voluntary control

  3. Mechanism of Contraction Heads on myosin filaments attach to actin filaments Filaments slide by one another then detach Process repeats itself many times in a single contraction Energy for contraction comes from ATP

  4. Muscles - Anterior

  5. Muscles - Posterior

  6. Skeletal Muscle Attachment • Tendon Attachments • Origin • Attachment to the bone that doesn’t move • Insertion • Attachment to the bone that does move • Antagonistic Pairs • Flexor • Flexes the joint (moves toward the body) • Extensor • Extends the joint (away from the body)

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