muscular tissue part 1

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Wesleypjones
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208117
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muscular tissue part 1
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2013-03-18 22:24:15
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muscular tissue part
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muscular tissue part 1
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  1. skeletal muscle tissue
    • most of it moves bones
    • it is striated meaning it alternates light and dark protein bands.  It works in a voluntary manner
  2. cardiac muscle tissue
    is striated and found only in the heart. its actions are involuntary.
  3. autorhythmicity
    the built in rhythm of the heart.  a pace maker that initiates contractions
  4. smooth muscle tissue
    is located in the walls of hollow internal structures, such as blood vessels, airways and most organs in the abdominopelvic cavity. is non striated which is why it is smooth. the action is usually involuntary
  5. muscular tissue functions
    • 1) produce body heat
    • 2)stabilizing body positions
    • 3) storing and moving substances
    • 4) producing body movements
  6. Muscular tissue properties:
    • 1) electrical excitability- the ability to create action potentials from stimuli
    • 2) contractibility
    • 3) extensibility- ability to stretch without damage
    • 4) elasticity- the ability to return to its original length and shape
  7. skeletal muscle fibers
    skeletal muscle cells called this because of their elongated shapes.
  8. connective tissue components
    it surrounds and protects muscular tissue.  it provides a pathway for nerves, blood vessels, and lymphatic vessels to enter and exit muscles.
  9. fascia
    is a dense sheet or broad band of dense irregular connective tissue that lines the body walls and limbs and supports and surrounds muscles. They hold muscles with similar functions together.
  10. Epimysium
    three layers of connective tissue extend from the fascia to protect and strengthen skeletal muscle.

    1) the outer most layer encircling the entire muscle
  11. perimysium
    three layers of connective tissue extend from the fascia to protect and strengthen skeletal muscle.

    2) surrounds groups of 10 to 100 or more muscle fibers separating them into bundles called fascicles
  12. endomysium
    • three layers of connective tissue extend from the fascia to protect and strengthen skeletal muscle.
    • 3) penetrating the interior of each fascicle and separating individual muscle fibers from one another.
  13. tendon
    all three connective tissue layers may extend beyond the muscle fibers.  A cord of dense irregular connective tissue composed of parallel bundles of collagen fibers that attach a muscle to the periosteum of a bone
  14. somatic motor neuron
    the neurons that stimulate the skeletal muscle to contract.  The axon typically branches many times, each branch extending to a different skeletal muscle fiber.
  15. hypertrophy
    an enlargement of existing muscle fibers
  16. sarcolema
    the plasma membrane of a muscle cell (fiber)
  17. Transverse T tubules
    thousands of tiny invaginations of the sarcolemma tunnel in from the surface to ward the centre of the muscle fiber.  Muscle action potentials travel along the sarcolemma and through these quickly spreading throughout the muscle fiber
  18. sarcoplasm
    the cytoplasm of a muscle fiber.  It has glycogen (for ATP synthesis) and myoglobin.
  19. myoglobin
    this protein found in muscles, binds oxygen molecules that diffuse into muscle fibers from interstitial fluid.
  20. myofibrils
    little threads in the sarcoplasm, these are the contractile organelles of skeletal muscle tissue.
  21. sarcoplasmic reticulum
    a fluid system of membranous sacs encircles each myofibril
  22. terminal cistern
    dilated end sacs of the sarcoplasmic reticulum butt against the t tubules from both sides
  23. muscular atrophy
    is a wasting away of muscles

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