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The Muscular System

The Muscular System. Objective 1. List four important functions of muscle tissue. Muscle Functions. Movement of the body and its parts Maintaining posture Stabilizing Joints Generating heat (shivering) THE ONLY THING MUSCLES CAN DO IS CONTRACT!!!. Characteristics of Muscles.

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The Muscular System

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  1. The Muscular System

  2. Objective 1 List four important functions of muscle tissue.

  3. Muscle Functions • Movement of the body and its parts • Maintaining posture • Stabilizing Joints • Generating heat (shivering) THE ONLY THING MUSCLES CAN DO IS CONTRACT!!!

  4. Characteristics of Muscles • Muscle cells are elongated (muscle cell = muscle fiber) • Contraction of muscles is due to the movement of microfilaments • All muscles share some terminology • Prefix myo refers to muscle • Prefix mys refers to muscle • Prefix sarco refers to flesh

  5. Objective 2 Compare and contrast the three main types of muscle tissue.

  6. The Muscular System Types • Three basic muscle types are found in the body • Skeletal muscle • Cardiac muscle • Smooth muscle

  7. Skeletal Muscle Characteristics • Most are attached by tendons to bones • Cells are multinucleate • Striated – have visible banding • Voluntary – subject to conscious control • Cells are surrounded and bundled by connective tissue

  8. Smooth Muscle Characteristics • Has no striations • Spindle-shaped cells • Single nucleus • Involuntary – no conscious control • Found mainly in the walls of hollow organs Figure 6.2a

  9. Cardiac Muscle Characteristics • Has striations • Usually has a single nucleus • Joined to another muscle cell at an intercalated disc • Involuntary • Found only in the heart Figure 6.2b

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