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All-or-none Response: Phenomenon in which a muscle fiber contracts completely when exposed to a threshold stimulus, or not at all. When a skeletal muscle is stimulated to contract by a motor neuron a minimum amount of stimulus is needed to start the process of muscle contraction.
Introduction ï§Muscle tissues share four basic properties: ï§ Excitability: the ability to respond to stimulation ï§Skeletal muscles normally respond to stimulation by the nervous system.ï§Cardiac and smooth muscles respond to the nervous system and circulating hormones.uscle Contraction ï§Contracting muscle fibers exert a pull, or tension, and shorten in length.ï§Caused by interactions between thick and thin filaments in each sarcomereï§Triggered by presence of calcium ionsï§Contraction itself requires the presence of ATP.