the muscular system
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The Muscular System

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The Muscular System. Your Muscles. Functions of the Muscular System. A muscle is made of strong tissue that can contract in an orderly way. When a muscle contracts, the cells of the muscle become shorter. When a muscle relaxes, the cells return to their original length.

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functions of the muscular system
Functions of the Muscular System
  • A muscle is made of strong tissue that can contract in an orderly way.
  • When a muscle contracts, the cells of the muscle become shorter.
  • When a muscle relaxes, the cells return to their original length.
functions of the muscular system cont
Functions of the Muscular System (cont.)
  • Bones move when muscles contract.
  • There are many muscles in your body that are not attached to bones.
  • The contraction of these muscles cause blood and food to move throughout your body.
  • Muscles that are attached to bones support your body and help you balance.
  • Muscles protect your body by covering most of your skeleton and most of the organs inside your body like a layer of padding.
functions of the muscular system cont1
Functions of the Muscular System (cont.)
  • Shivering occurs when muscles contract rapidly and change chemical energy to thermal energy, thereby raising your body’s temperature.
  • Muscles also change chemical energy to thermal energy during exercise.

Muscle Attach to Bones

  • Tendons are strands or tough connective tissue that connect your skeletal muscles to your Bones.

Muscles Work in Pairs

  • Skeletal muscles often work in pairs. A muscle that bends part of your body is called a flexor. A muscle that straightens part of your body is an extensor.
muscle pairs cont
Muscle Pairs (cont.)

Bend Your Arm

  • Bicep muscles-contract (flexor)
  • Tricep muscles-relax (extensor)

Straighten Your Arm

  • Bicep muscles-relax (flexor)
  • Tricep muscles-contract (extensor)
muscle control voluntary muscles
Muscle Control: Voluntary Muscles
  • Muscles that you are able to control
    • Ex. Arm and leg muscles, muscles of your hands and face
  • You can choose to move them or not
muscle control involuntary muscles
Muscle Control: Involuntary Muscles
  • Muscles that you can’t consciously control
  • These muscles work all day long, all your life.
    • Ex. Blood gets pumped through blood vessels, food is moved through the digestive system by the action of involuntary muscles.
three types of muscle 1 smooth
Three Types of Muscle: (1) Smooth
  • Muscles found in the walls of many organs
  • Involuntary in action cannot be controlled by will/brain
    • Ex. Digestive system and blood vessels
three types of muscle 2 cardiac
Three Types of Muscle: (2) Cardiac
  • An involuntary muscle found in your heart
  • Appear striated or skeletal in nature
three types of muscle 3 skeletal
Three Types of Muscle: (3) Skeletal
  • Alsocalled striated muscles
  • These muscles are attached to the skeleton for movement.
  • Can be voluntary or involuntary
    • Ex. Legs/arms are voluntary
  • Skeletal muscles work in pairs
keeping muscles healthy
Keeping Muscles Healthy
  • Exercise helps keep muscles healthy. Muscle cells decrease in size and strength without exercise.
  • Resistance Exercise
    • During resistance exercise, people work against the resistance, or weight of an object to strengthen their skeletal muscles.
  • Aerobic Exercise (using oxygen)
    • Steady, moderately intense activity is called aerobic exercise and it strengthens the heart and increases endurance.
muscle injury
Muscle Injury
  • A strain is an injury when a muscles or tendon is overstretched or torn.
  • A sprain is when a ligament is stretched or torn from a joint.
  • People who exercise too much can hurt their tendons. Inflamed tendons is called tendonitis.
the muscular system and homeostasis
The Muscular System and Homeostasis
  • Muscle contractions convert chemical energy to thermal energy and keep your body warm.
  • When you exercise, the cardiac muscles of your heart help maintain homeostasis by contracting more often.
  • When it contracts faster, the heart pumps more blood and more oxygen is carried to the cells.
lesson review questions 1
Lesson Review Questions: 1

What happens to a muscles when it contracts?

  • It becomes stronger
  • It becomes shorter
  • It becomes longer
  • It bends
lesson review questions 2
Lesson Review Questions: 2

What kind of muscles line blood vessels and many organs?

  • Smooth Muscles
  • Voluntary Muscles
  • Cardiac Muscles
  • Skeletal Muscles
lesson review questions 3
Lesson Review Questions: 3

What is the term used to describe muscles that you can consciously control?

  • Skeletal
  • Involuntary
  • Cardiac
  • Voluntary