Anatomy

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Anonymous
ID:
190322
Filename:
Anatomy
Updated:
2012-12-20 15:40:20
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semester test review
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  1. Three types of muscle tissue
    • 1.skeletal
    • 2.cardiac
    • 3.smooth
  2. -voluntary
    -striated
    -attaches to bone
    skeletal
  3. -only in heart
    -striated
    -branched and involuntary
    cardiac
  4. -in hollow organs
    -not striated
    -involuntary
    smooth
  5. Characteristics of muscles?
    • 1.excitability: responds to stimuli
    • 2.contractility: ability to shorten
    • 3.extensibility: stretch
    • 4.elasticity:recoil
  6. Functions of muscles?
    • 1.movement of bones
    • 2.maintain posture
    • 3. stabilizing joints
    • 4.heat generation
  7. -myo
    -mys
    -sacro
    All mean what?
    muscle
  8. In between individual muscle fibers
    endomysium
  9.  groups of muscle fibers?
    fascicle
  10. wraps groups of muscle fibers together
    perimysium
  11. surround the muscle itself
    epimysium
  12. -densely packed
    -80% of cells volume
    myofibrils
  13. -region between z discs
    -thick and thin filaments
    -smallest unit of muscle fiber
    sarcomere
  14. A thin filament is called?
    actin
  15. A thick filament is called?
    myosin
  16. Thick filaments belong to?
    A band
  17. Thin filaments belong to?
    I band
  18. Middle of I band (line)
    Z disc or line
  19. Lighter region- where thick filaments do not overlap
    H zone
  20. Hold thick lines together towards center
    M line
  21. Chemical in Muscle contraction?
    • 1.myosin
    • 2.actin
    • 3.tropomyosin: myosin attachment to actin
    • 4. troponin
    • 5.Ca+
    • 6. ATP
  22. What filament move during contraction/
    Thin
  23. Steps on contraction?
    • 1. exposure to binding sites
    • 2.myosin binds with actin
    • 3.power stroke
    • 4.disconnecting of myosin head
    • 5.reenergizing head
    • 6.removal of Ca+ ions
  24. -leave troponin
    -Ca+ is taken back to sarcoplasma by active transport
    -tropomyosin covers binding sites
    Removal of Ca+ ions
  25. -ATP is broken
    -reloads myosin
    Reenergizing head
  26. -ATP binds to myosin( allowing thick filament to disconnect)
    -rigor mortis
    disconnecting myosin head
  27. -ATP--> ADP +P
    -causes myosin head to flex pulling actin toward center of sacromere
    power stroke
  28. -myosin hinges at tail, bending up and attaching to actin
    myosin binds to actin
  29. -Sacrolemma--> action potential reaches muscle cell membrane(goes both directions-to stimulate muscle fibers)
    -muscle cells filled with Ca+ released from terminal cisternae
    -troponin changes shape-expose binding sites
    exposure of binding sites on actin
  30. What must be present for muscle contraction?
    Ca+ and ATP

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