![]() Muscle fibers are formed by the fusion of developmental myoblasts, which will take place during a process which is known as myogenesis. The fibers and muscles are always surrounded by the connective tissue layers which are known as fasciae. action potential, the brief (about one-thousandth of a second) reversal of electric polarization of the membrane of a nerve cell (neuron) or muscle cell. Note: A skeletal muscle is always referred to as multiple bundles known as fascicles of cells joined together called muscle fibers. So, the correct answer is ‘Whole skeletal muscle’. This relationship holds just for the unit of tissue for nerve tissue, the unit is that the neuron, for striated muscle the unit is that the individual muscle cell and for the guts, the unit is that the entire auricles or the whole ventricles. This basic property of the only nerve fiber is termed the all-or-none relationship. Either the only fiber doesn't respond with spike production, or it responds to the utmost of its ability under the conditions at the instant. If it's of threshold strength or over, a spike (a nervous impulse) of maximum magnitude is about up. observed conducted contractures without action potentials on mechanical stimula- tion of single striped muscle fibers of the retrolingual membrane of the frog. An electrical stimulus below threshold strength will fail to elicit a propagated spike potential. This wave of depolarization progresses as a result of closely controlled, sequential opening of gated ion channels, which allow sodium and potassium ions to cross the plasma membrane. ![]() If that stimulus due to some reason exceeds the threshold potential, the nerve or muscle fiber will provide a complete response otherwise, there's no response.Īdditional Information: The magnitude of the action potential which is found out in any single nerve fiber is independent of the strength of the exciting stimulus, provided the latter is adequate. An action potential is a rapidly progressing, sequential, wave-like depolarization of the cell membrane, with an instantaneous repolarization to the resting state. The law which is known as all-or-none law is the principle that tells us that the strength by using which a nerve or muscle cell will be responding to the stimulus is independent of the strength which stimulus has. Hint: All or none law is not applicable for the muscle which is a form of striated muscle tissue that is under the voluntary control of the somatic nervous system.Īll or none law is not applicable for Whole skeletal muscle. ![]()
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