All-or-None Principle
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If the stimulus is below the minimum required for contraction, it is considered to be a
subthreshold stimulus, and the muscle fibers will not contract at all
Once stimulated by a sufficient number of nerve impulses, a muscle fiber contracts to its maximum capacity. This tendency to contract fully or not at all is called
all-or-none principle
When a sufficient string stimulus is received by a motor neuron, the impulse is transmitted to
the muscle fibers in a motor unit.
The minimal nervous stimulation needed to cause a muscle fiber to contract is called
the threshold stimulus