THE MUSCULAR SYSTEM     Mrs. Neistadt   Biology
THE MUSCULAR SYSTEM
MUSCULAR SYSTEM*There are 206bones in the body* There areapproximately 640skeletal muscles in thebody.
*Three Types of Muscle *Muscles are classified according to their  structure and function.
*SMOOTH MUSCLE*Involuntary Muscle*Muscle of the internal organs:(stomach, intestines, etc.)*Not striated, or striped, 1...
*CARDIAC MUSCLE*Involuntary*Only in the heart muscle*Contracts efficiently andrhythmically*Striped or Striated, with l...
*SKELETAL MUSCLE*Voluntary Muscle*Attached to bones by     tendons*When contracted, cause     the body to move
Skeletal Muscle Contraction *Most skeletal muscles are arranged in  opposing, or antagonistic pairs.
Muscle Fibers
*TWO TYPES OF MUSCLE       FIBERS: Slow-         Fast- twitch       twitch
*Slow-twitch muscle fibers *Slow-twitch muscle fibers have more  endurance than fast-twitch muscle  fibers. They contai...
SLOW-TWITCH FIBERS
Fast-Twitch Muscle Fibers *Fast-twitch muscle fibers fatigue easily  but provide great strength for rapid,  short movemen...
FAST-TWITCH FIBERS
ENERGY FOR MUSCLES*Muscle cells need energy to contract*Muscle cells use cellular respiration to make       ATP (adenosi...
WHEN SOMETHING GOES        WRONG…Muscular Dystrophy-  • An inherited disease that    affects the skeletal    muscles in t...
REVIEW QUESTIONS:    W R I T E O N A S E PA R A T E PA P E R T O T U R N I N :1. Compare and Contrast skeletal, smooth and...
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The muscular system

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The muscular system

  1. 1. THE MUSCULAR SYSTEM Mrs. Neistadt Biology
  2. 2. THE MUSCULAR SYSTEM
  3. 3. MUSCULAR SYSTEM*There are 206bones in the body* There areapproximately 640skeletal muscles in thebody.
  4. 4. *Three Types of Muscle *Muscles are classified according to their structure and function.
  5. 5. *SMOOTH MUSCLE*Involuntary Muscle*Muscle of the internal organs:(stomach, intestines, etc.)*Not striated, or striped, 1 nucleus
  6. 6. *CARDIAC MUSCLE*Involuntary*Only in the heart muscle*Contracts efficiently andrhythmically*Striped or Striated, with lightand dark bands and many nuclei
  7. 7. *SKELETAL MUSCLE*Voluntary Muscle*Attached to bones by tendons*When contracted, cause the body to move
  8. 8. Skeletal Muscle Contraction *Most skeletal muscles are arranged in opposing, or antagonistic pairs.
  9. 9. Muscle Fibers
  10. 10. *TWO TYPES OF MUSCLE FIBERS: Slow- Fast- twitch twitch
  11. 11. *Slow-twitch muscle fibers *Slow-twitch muscle fibers have more endurance than fast-twitch muscle fibers. They contain myoglobin, a respiratory molecule that stores oxygen and serves as an oxygen reserve.
  12. 12. SLOW-TWITCH FIBERS
  13. 13. Fast-Twitch Muscle Fibers *Fast-twitch muscle fibers fatigue easily but provide great strength for rapid, short movements. They rely on anaerobic metabolism, which causes a buildup of lactic acid.
  14. 14. FAST-TWITCH FIBERS
  15. 15. ENERGY FOR MUSCLES*Muscle cells need energy to contract*Muscle cells use cellular respiration to make ATP (adenosine triphosphate)* ATP = Energy (aerobic)*If enough oxygen is not available, muscleswill rely on lactic acid fermentation for energy.(anaerobic)
  16. 16. WHEN SOMETHING GOES WRONG…Muscular Dystrophy- • An inherited disease that affects the skeletal muscles in the body. • Eventually, the muscles are destroyed and the person may become paralyzed.
  17. 17. REVIEW QUESTIONS: W R I T E O N A S E PA R A T E PA P E R T O T U R N I N :1. Compare and Contrast skeletal, smooth and cardiac muscle.2. Explain why it is important for skeletal muscles to be foundantagonistic (opposite) pairs.3. Explain why it is important that no muscle contains only slow-twitch or only fast-twitch fibers.4. When does a muscle require ATP?5. Related to #4: Why does your body use energy even when youare sleeping?
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