Term
| muscles are connected to bones by: |
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Definition
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Term
| skeletal muscles are compared of hundreds of muscles cells called: |
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Definition
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Term
| an isotonic contraction of a skeletal muscle is one in which: |
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Definition
| length of the muscle decreases |
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Term
| a single action potential in a motor axon creates: |
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Definition
| single action potential in the muscle fibers it contacts and a single contraction |
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Term
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Definition
| motor neuron and the muscle fibers it supplies |
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Term
| low-voltage electrical shock (0 - .1 volts) produced no response on the screen because: |
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Definition
| the shock did not stimulate any muscle fibers to threshold for action potential production |
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Term
| smallest response you recorded, with a shock around .3 volts, was produced by: |
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Definition
| a contraction of a small number of the fibers in the muscle |
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Term
| increasing the shock voltage from about .3 to 1 volt increased the amount of tension produced by the muscle. this observation can be explained by: |
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Definition
| an increase in the number of contracting muscle fibers |
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Term
| high-voltage shocks produced a contraction that exhibited near-constant maximum tension. this can be explained as: |
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Definition
| single twitch-type contraction of all of the fibers in the muscle |
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Term
| in this experiment, the frog's muscle contractions are directly caused by: |
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Definition
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Term
| in the living frog, increasing the number of active motor units: |
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Definition
| makes more muscle fibers contract |
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Term
| in the living frog, recruitment of motor units into the contraction response is achieved by: |
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Definition
| activating more upper motor neurons |
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Term
| in the living frog, stimulation of spinal (lower) motor neurons is achieved by: |
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Definition
| stimulating more spinal motor neurons by the upper motor neurons |
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