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Life Science : 1.3 The Muscular System
Objectives: List three kinds of muscle tissue. Describe how skeletal muscles move bones. Compare aerobic exercise with resistance exercise. Describe two muscular system injuries.
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.
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.
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.
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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Life Science 1.3 : The Muscular System

  • 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.