6 - Muscle

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Author:
FuryX27
ID:
37701
Filename:
6 - Muscle
Updated:
2010-09-27 16:06:12
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BIO205
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exam 1 review
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  1. characteristics of muscle
    • -contractibility
    • -muscle tissue is derived from mesoderm
    • -classifications:
    • -skeletal
    • -cardiac
    • -smooth
  2. skeletal muscle
    • -has striations
    • -fibers
    • -multinuclei
    • -has sarcoplasmic reticulum
    • -voluntary
    • -located in muscles of arms, legs, ect
  3. cardiac muscle
    • -has striations
    • -cells
    • -1-2 nuclei
    • -has sarcoplasmic reticulum
    • -involuntary
    • -spontaneous
    • -found in heart
  4. smooth muscle
    • -no striations or cells
    • -1 nuclei
    • -involuntary
    • -spontaneous
    • -found in internal organs
  5. function of skeletal muscle
    • –SUPPORT
    • –MOVEMENT
    • –HOMEOSTASIS
    • –PROTECTION
    • –RESPIRATION
    • –CIRCULATION
  6. Muscle CT
    (from largest to smallest)
    • 5.Muscle ~ Epimysium
    • 4.Fascicle ~ Perimysium
    • 3.Fiber ~ Endomysium
    • 2.Fibril (intracellular0
    • 1.Filament (intracellular)
  7. sarcomere
    basic contractile unit
  8. striations
    -due to overlap of actin and myosin

    -bands change in length during stretch & relaxation
  9. Sarcomere: Z – Z
    I-band – only actin
    A-band – length of mysin
    H-band – only myosin
    • Myofibrils->
    • Myofilaments
    • •Actin (thin)
    • -troponin
    • -tropomyosin
    • •Myosin (thick)
  10. •Membrane systems:
    •Sarcolemma
    •Transverse (“T”) Tubule
    •Sarcoplasmic Reticulum (SR)
    •Triads
  11. •Sarcoplasmic Reticulum
    –Ca++ sequestration
  12. Neuromuscular Junction
    • Nerve terminal
    • • Synaptic vesicles
    • • Neurotransmitter
    • -(acetylcholine)

    • Motor end plate:
    • Synaptic clefts
    • Acetylcholinesterase
    • Acetylcholine receptors
  13. Mesenchyme - Myoblasts - Myotubes - Myofibers - Reserve Myoblasts - Satellite Cells
  14. •Individual cells can divide
    •Multi-nucleate fibers cannot
    •Satellite cells can divide
    •DNA is added to multi-nucleate muscle fibers by fusion of satellite cells
    RAHHHHHHH =[)
  15. smooth muscle
    • -single cells, no striations
    • -contraction:
    • -actin, myosin present
    • -contractile filaments anchored by "dense bodies" (act similar to z-bands)
    • -spontaneuosly active
    • -connected by gap juntions
    • -located in internal organs, blood vessels
    • -often arranged in logitudinal and circular groupings
  16. cardiac muscle
    • -striated
    • -single cells
    • -central nuclei
    • -branching fibers
    • -spontaneously active
    • -intercalated discs
    • -gap juntions
    • -tight junctions

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