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Unformatted text preview: number of muscle fibers per motor unit maybe as high as several hundred or as few as four. T'he Muscle Twitch The response of a motor unit to a single action potential of its motor neuron is called muscle twitch. A myogram is a graphic recording of contractile activity to witch a muscle is attached during the investigation of muscle contraction at a laboratory.The three distinct phase of each twitch myogram : o Latent period: first millisecond when muscle contraction stafi. . Period of contraction: when crossed bridges are active. o Period of relaxation: period of contraction followed by the period of relaxation. Muscle Metabolism The body provides the energy needed for contraction. Store ATP: As a muscle contracts, ATP provide the energy for cross bridge movement and detachment and for operation of the calcium pump. The only source of energy used directly for contractile activities....
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- Spring '11
- Force, muscle tension, muscle contracts