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Objective HO6.02

Objective HO6.02. Analyze the function of the muscular system. First let’s review a couple of terms: Voluntary -muscle groups the we can control. Involuntary - muscles not under our conscious control. NOW LET’S LEARN FOUR IMPORTANT FACTS ABOUT MUSCLES. CHARACTERISTICS OF MUSCLES.

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Objective HO6.02

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  1. Objective HO6.02 • Analyze the function of the muscular system.

  2. First let’s review a couple of terms: Voluntary-muscle groups the we can control. Involuntary- muscles not under our conscious control

  3. NOW LET’S LEARN FOUR IMPORTANT FACTS ABOUT MUSCLES.

  4. CHARACTERISTICS OF MUSCLES • CONTRACTIBILITY – the ability of a muscle to reduce the distance between the parts of its contents or the space it surrounds. It shortens!! • EXCITEABILITY(IRRITABILITY) – the ability to respond to certain stimuli by producing impulses. • EXTENSIBILITY– the ability to be stretched. • ELASTICITY– ability of muscle to return to its original length when relaxing.

  5. MOVEMENT How do muscles move bones? By pulling on them!! Pairs or groups of muscles usually contract to produce a single movement.

  6. Origin Thepart of the skeletal muscle that is attached to a fixed structure or bone and remains in place.

  7. Insertion The other end that is attached to a movable part. The part of the muscle that moves during a muscle contraction.

  8. Belly The central body of the muscle.

  9. Prime Mover The muscles of the body are arranged in pairs. One produces movement in a single direction. This muscle is called the prime mover. While….

  10. Antagonist Moves the muscle in the opposite direction from the prime mover.

  11. An Example of Movement Biceps and Triceps… When you flex your arm, the biceps act as the prime mover and the triceps act as the antagonist. When you extend your arm, the triceps serve as the prime mover and the biceps serve as the antagonist.

  12. MOTOR UNIT page 128 A motor neuron plus all the muscle fibers it stimulates. www.guam.net/.../TheNueron_files/image015.gif www.guam.net/.../TheNueron_files/image015.gif

  13. Synergist • Group of muscles that help steady a movement or stabilize joint activity.

  14. Neuromuscular Junction The junction between the motor neuron’s fiber which transmits the impulse and the muscle cell membrane. labs.ansci.uiuc.edu/meatscience/Library/Copy%...

  15. ACETYLCHOLINE Is aChemical neurotransmitter. It diffuses across the synaptic cleft. (carries impulse across synaptic cleft) science.ust.hk/department/chem/13a.jpg

  16. MUSCLE FATIGUE Caused by the accumulation of lactic acid in the muscles.

  17. OXYGEN DEBT • Occurs after exercise. It is the amount of oxygen needed by the muscle to change lactic acid back into glucose.

  18. MUSCLE TONE When muscles are slightly contracted and ready to pull. http://www.numberonetrainer.com/ladies%20of%20fantastic%20fitness%20018.jpg

  19. Isometric Contraction • When the tension in the muscle increases but the muscle does not shorten, i.e. tensing your abdominal muscles. Think about it like: Isometric= minimal movement

  20. Isotonic Contraction When the muscles contract and shorten….when you walk and talk. Think about it like: Isotonic = traveling movement

  21. DON’T FORGET TO STUDY HARD . • SOMEBODY TELL ME WHEN THE TEST IS GOING TO BE.

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