Excitable Cell Muscles

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Humans and animals are made of three specific muscles: skeletal, cardiac, and smooth. Out of the three muscles skeletal muscle is similar to nerve tissue, in which the fiber responds to a stimulus in all-or-none fashion. The all-or-none relation is necessary consequence of the three conditions in the excitable cell: a threshold, an absolute refractory period, and a conduction of the excited state over the whole structure so that it behaves as a single unit (Rosenblueth, 1935). A motor neuron is responsible for innervating the muscle, triggering it to either contract or relax. Depending on the intensity and frequency of stimulus, greater numbers of fibers are activated. Muscle contractions can be strengthened if there is an increase in the

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