physiology 5

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physiology 5
2011-01-31 17:47:26
physiology moffat

5th lecture for moffat physiology
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  1. sympathetic mechanism
    flight or fight ( increased HR, pupil dilolation, increased respiration.) maintians blood pressure, keeps blood vessels constintly constricted by way of smooth muscles so its always releasing so it alsergenic and either alpha or beta receptors
  2. parasympathetic
    rest and digest, decreased heart rate usually always on. (pupil constriction, stimulates salvitory nasal and lacromial gland) digestive and urinary production.
  3. motor unit
    number of number cells in contanct with that branch of a motor neuron. The more muscle cells the stronger the force that can be created. The less the branches the finer control you have.
  4. End plate potential
    Its a graded current (membrane potential) but in the motor end plate region.
  5. nicotinic sodium channels
    for the contraction of a muscle fiber
  6. DHP receptor
    has action potental to release the Ca+ in the wall of the t-tubule. activates the ranodine receptor ryanodine.
  7. Troponin complex
    more then one protien thats the binding site for Ca+ to bind onto troponin so that it can move the tropomyosin so the active sites are exposed so the myosine heads can attach.
  8. isotonic contraction
    • skeletal muscle changes in length
    • concentric contraction- muscle shortens
    • eccentric contraction- muscle lengthens
  9. isometric contraction
    muscle developes tension but it doesnt change length. negative workout