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11 Cards in this Set
- Front
- Back
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Sacomere
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The repeating unit of a myofibril
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Neuron
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The functional unit of the nervous system, a nerve cell
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Synapse
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The interface between a nerve cell and another cell
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Neurotransmitter
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A chemical released by a neuron. This chemical travels across the synaptic cleft, allowing the neuron to communicate with another cell.
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Motor unit
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One motor neuron and all the muscle fibers it innevrates
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All-or-none law of skeletal muscle contraction
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An individual muscle fiber contracts with equal force in response to each action potential
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Subthreshold stimulus
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A stimulus too small to create an action potential in a neuron
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Threshold stimulus
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A stimulus strong enough to create on action potential in a neuron
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Submaximal stimuli
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Stimuli of increasing strength that create more action potentials along more neurons
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Maximal stimulus
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A stimulus which is strong enough to create action potentials in all the motor neurons innervating a whole muscle
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Muscle tone
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The state of partial contraction in a muscle, even when the muscle is not being used
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