Muscles
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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sarcomeres | actin and myosin myofilaments form highly ordered units
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motor unit | a single motor neuron and all the skeletal muscle fibers it innervates
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presynaptic terminal | enlarged nerve terminal
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synaptic cleft | space between the presynaptic terminal and the muscle cell
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postsynaptic terminal | muscle fiber
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synaptic vesicles | diffuses across the synaptic cleft
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acetylcholine | neurotransmitter
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resting membrane potential | charge difference across the membrane
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motor neurons | nerve cells that carry action potentials to skeletal muscle fibers
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acetylcholinesterase | enzyme
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recruitment | increase in number of motor units being activated
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ATP | adenosine triphosphate
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ADP | adenosine diphosphate
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tetany | muscle remains contracted without relaxing
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lag phase | time between application of a stimulus to a motor neuron and beginning of contraction
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contraction phase | time of contraction
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relaxation phase | time during which the muscle relaxes
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