PA - Skeletal Muscle Adaptations to regular PA
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| muscle fibers are regulated in subgroups activated by a single motor neuron called a : | motor unit
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| what is a neuromuscular junction? | where nerve meets the muscle ending
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| if the nerve ending is cut, what will happen? | muscle won't contract
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| influx of sodium (Na+) is called | depolarization
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| efflux of potassium (K+) is called | repolarization
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| impulse from motor neuron results in... | release of ACh into the neuromuscular junction
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| why isn't ACh a hormone? | b/c its released on site & only effects neuromuscular junction
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| after ACh is released..what happens? | sodium comes in
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| after the sodium comes in then... | the action potential travels and releases calcium
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| after calcium is released then it... | binds to troponion & form cross bridges
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| where is calcium stored? | sarcoplasmic reticulum
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| thin filament is known as | actin
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| myosin | thick filament
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| __ and __ work together so muscle can contract | actin & myosin
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| as long as calcium is involved... | you have muscle contraction
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| muscle fibers relax when... | no more calcium is being released
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| after cross bridges are form. troponin moves troporhysin & exposes __ | actin
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| after actin gets exposed so does everything else. the last step is __ | calcium returns to SR
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Created by:
Mariahj25
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