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Function of Muscles

Function of Muscles. Produce movement Maintain posture Communication: speak, write, read, etc. Breathing Moving food through digestive tract Pumping blood through body Eliminating waste Stabilize joints Generate heat. Characteristics of Muscles.

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Function of Muscles

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  1. Function of Muscles • Produce movement • Maintain posture • Communication: speak, write, read, etc. • Breathing • Moving food through digestive tract • Pumping blood through body • Eliminating waste • Stabilize joints • Generate heat

  2. 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

  3. The Muscular System • Muscles are responsible for all types of body movement • Three basic muscle types are found in the body • Skeletal muscle • Cardiac muscle • Smooth muscle

  4. 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

  5. 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

  6. 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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