Comparative Test 3 (Vocab)

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mc166589
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113837
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Comparative Test 3 (Vocab)
Updated:
2011-11-01 23:04:05
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Comparative Anatomy
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Comparative anatomy lecture test 3.
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  1. Isotonic contractions
    Shortening of muscle against a constant load or force.
  2. Isometric contractions
    Little or no contraction although muscle is acting against a force.
  3. Negative work contractions
    Muscle fibers elongate rather than contract as tension increases.
  4. Smooth muscle
    elongated, nonstriated, spindle shaped cells; provide slow, sustained contraction; single nucleus.
  5. Unitary smooth muscle
    Occurs in most viscera, myogenic contraction but modulated by nerve impulses.
  6. Multiunit smooth muscle
    Is found in blood vessels, eye, neurogenic contraction.
  7. Cardiac muscle
    Moderately enlongated, striated and branching cells tightly united by intercalating discs; myogenic modulated by nerve impulse; one or more nuclei per cell.
  8. Skeletal muscle
    Extremely long striated and multinucleated cells; supports body and effects movement of the organism.
  9. Motor units
    A neuron and the skeletal muscle fibers it innervates.
  10. Motor end plates
    Points where branches of neuron attach to muscle fiber.
  11. Tonic fibers
    Contract slowly to provide tonus. Muscles that move the eyeball in mammals. Postural muscles in appendages of lower vertebrates.
  12. Phasic fibers
    Most vertebrate skeletal muscles. Has two different types which include slow and fast.
  13. Electric organs
    Modified muscles tissue in about 250 species of fish.
  14. Electroplaxes
    Make up electric organs. They are modified muscle cells or their motor endplates.
  15. Receptors
    Transducers of mechanical, electrical, thermal, chemical, and radiant energy.
  16. External receptors
    Provide information about the external environment. It is a type of somatic receptors.
  17. Proprioceptors
    Provide information about skeletal muscle activity.
  18. Visceral receptors
    Monitor internal environment.
  19. Inner ear
    Sense organ present in all vertebrates.
  20. Neuromast system
    Membranous labyrinths located in skeletal labyrinth surrounded by fluid-filed perilymphatic space.
  21. Sensory neruomast sites
    Are located in squamous epithelium of the sacculus, utriculus, and lagena/cochlea.
  22. Maculae
    Patches of hair cells found in sensory neuromast sites.
  23. Crista
    An enlarged neuromast which occurs in a swelling

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