YOUR MUSCULAR SYSTEM

1
YOUR MUSCULAR SYSTEM

• Teen Health, Chapter 16
• Pages 409-412

2
Your Muscles

• The muscular system the group of muscles that
  give your body parts the power of movement.

3
The Functions of your Muscular System

• Muscles give your body movement
• 2. Muscles pump blood throughout your body
• 3. Muscles move food through your digestive
  system
• 4. Muscles control the movement of air in and
  out of your lungs

4
Types of Muscles

• Different types of muscles have different jobs
  throughout the body.
• Skeletal muscles muscles that are attached to
  bones that enable you to move
• - the largest part of the bodys muscular
  system
• - more than 600 skeletal muscles in your body
• - these muscles are voluntary, you control
  movement

5
Types of Muscles

• Smooth muscles are muscles found in organs,
  blood vessels and glands
• - examples of smooth muscles are
• -the mouth
• -the stomach
• -the lungs
• - smooth muscles are involuntary, they operate
  without your awareness

6
Types of Muscles

• Cardiac muscles muscles that are found only in
  the walls of your heart
• - cardiac muscles are involuntary,
• - these muscles will flex and contract your
  heart even if you are sleeping

7
How Muscles Work

• Muscle movement is triggered by impulses
• These impulses are sent to muscle fiber
• Muscle fiber narrow strands of tissue within
  the muscle

8
How Muscles Work

• 2 basic actions that account for all muscle
  movement
• Contraction the shortening of the muscle
• Extension the lengthen of the muscle
• Example When you bend your arm, your biceps will
  contract and pull on a bone of your lower arm to
  make the arm bend. While this is happening, your
  triceps will extend.

9
Problems of the Muscular System

• Muscle Soreness is a temporary condition
  brought on by exercise
• 2. Muscle Strain is caused by small tears in
  the muscle fibers
• - usually occurs in the larger muscles from
  being over worked

10
Taking Care of your Muscular System

• The heart is your bodys most important muscle.
  Regular exercise will increase your hearts
  strength and performance
• Be sure to warm-up before every workout and
  cool-down after every workout to prevent muscle
  strain.
• Use it or Lose it if muscles are not active,
  then they will lose their muscle tone.
• Muscle tone the natural tension in the muscle
  fibers

11
Muscles you Need to Know

• Sternomastoid moves your head
• Trapezius raises your head and shoulders
• Pectoralis major moves your chest
• Deltoids raise your arms
• Latissimus dorsi muscles that lower your arm
• Abdominal flexes your torso
• Obliques help with breathing
• Biceps bends your arm at the elbow
• Triceps straightens your arm at the elbow

12
Muscle you Need to Know

• Gluteus maximus extends your thigh raises
  your torso from a bent position
• Quadriceps straightens and raises your leg
• Hamstrings bends your leg at the knee
• Gastrocnemius extends or lowers your foot when
  walking on tiptoes
• Anterior tibial flexes your ankle and foot