The Muscular System

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The Muscular System
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The Muscular System
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• A. There are three types of muscle tissue
• 1. Smooth muscle
• a. Found in the walls of your internal organs
  and blood vessels.
• b. They are involuntary-there is no conscious
  control of this muscle.

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• 2. Cardiac muscle
• a. Involuntary muscle found only in the heart.
• b. Generate and conduct electrical impulses.

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Types of Muscle Tissue
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• 3. Skeletal muscle
• a. This muscle is attached to and moves your
  bones.
• b. They are all voluntary-you have control over
  their movement.

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How Muscles Work
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• B. Anatomy of a muscle fiber
• 1. Myofibril-Smaller units found in a muscle
  fiber.

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• 2. Myosin- Thick filaments are made of this
  protein.
• 3. Actin- thin filaments are made of this
  protein.

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• 4. Sarcomere- Sections of myofibrils.

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• 5. The sliding filament theory-When signaled,
  the actin filaments within each sarcomere slide
  toward one another, shortening the fiber and
  causing muscle to contract.

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• 6. Muscle strength
• a. Depends on thickness of fibers.
• b. Regular exercise increases diameter of
  fibers.
• 1. aeorbic exercise- Uses ATP efficiently
• 2. anaeirobic exercise- Uses ATP ineficiently
  producing lactic acid.

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Summary