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University of Iowa Human Biology Final Exam correctly answered
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University of Iowa Human Biology Final Exam correctly answered
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University of Iowa Human Biology FinalExam
cardiac muscle - correct answer ✔✔striated
involuntary
smooth muscle - correct answer ✔✔non-striated
involuntary
skeletal muscle - correct answer ✔✔striated
voluntary
origin of a muscle - correct answer ✔✔end of muscle that is attached to the stationary bone
insertion of a muscle - correct answer ✔✔end of muscle tat is attached to a moveable bone across a
joint
muscle contraction pulls ______ toward ______ - correct answer ✔✔insertion;origin
(insertion moves)
fascicle - correct answer ✔✔bundle of structures, like nerves or muscle fibers
fascia - correct answer ✔✔thin sheath of fibrous tissue enclosing a muscle or other organ
myofiber - correct answer ✔✔fascicles are bundles of myofibers
myofibril - correct answer ✔✔bundle of long, cylindrical structures
, actin - correct answer ✔✔thin filaments
myosin - correct answer ✔✔thick filaments
T tubule - correct answer ✔✔small tubules that run transversely through striated muscle fibers
troponin - correct answer ✔✔attached to tropomyosin
binding sites for calcium
tropomyosin - correct answer ✔✔wraps around actin
blocks formation of cross bridges when muscle is relaxed
cross bridge - correct answer ✔✔formed when myosin heads bind to actin fibers
sarcoplasmic reticulum - correct answer ✔✔inside myofiber cells
calcium stored here
sarcomere - correct answer ✔✔structural unit of a myofibril in striated muscle
steps of muscle contraction - correct answer ✔✔1. neuron action potential arrives at end of motor
neuron
2. ACH released
3. ACH binds to receptors on motor end plate
4. permeability of sarcomere changes (Na rushes in) (action potential produced)
5. muscle action potential sweeps into the T tubules triggering...
6. release of Ca from cisternae of sarcoplasmic reticulum
7. Ca binds to troponin
8. troponin changes shape ad shifts tropomyosin to expose binding sites of actin
9. myosin binds to actin (cross bridge formed) (ADP released from myosin)
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