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Life Science 1.3 : The Muscular System
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Life Science 1.3 : The Muscular System

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  • 1. Life Science : 1.3
    The Muscular System
  • 2. Objectives:
    List three kinds of muscle tissue.
    Describe how skeletal muscles move bones.
    Compare aerobic exercise with resistance exercise.
    Describe two muscular system injuries.
  • 3. Kinds of Muscle
    Muscular system
    Made up of the muscles that let you move.
    Three Kinds of Muscle
    Smooth muscle
    Involuntary muscle found in the digestive tract and the walls of the blood vessels.
    Cardiac muscle
    Involuntary muscle found in your heart.
    Skeletal muscle
    Muscle attached to your skeleton for movement is called.
    Skeletal muscle can be voluntary or involuntary.
  • 4. Movement
    Muscles Attach to Bones
    Tendons are strands of tough connective tissue that connect your skeletal muscles to your bones.
    Muscles Work in Pairs
    Skeletal muscles often work in pairs.
    Flexor
    A muscles that bends part of your body.
    Extensor
    A muscle that straightens part of your body.
  • 5.
  • 6. Use It or Lose It
    Resistance Exercise
    During resistance exercise, people work against the resistance, or weight, of an object to strengthen their skeletal muscles.
    Aerobic Exercise
    Steady, moderately intense activity
    Strengthens the heart and increases endurance.
  • 7. Muscle Injury
    Strain
    an injury in which a muscle or tendon is overstretched or torn.
    Tendonitis
    Inflamed tendons
    People who exercise too much can hurt their tendons.
    Some people try to make their muscles stronger by taking drugs.
    These drugs are called anabolic steroidsand can cause long-term health problems.

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