lab3 - Ex.- 5.2 1.) (a) Twitch is a response of skeletal...

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Ex.- 5.2 1.) (a) Twitch is a response of skeletal muscle to a single stimulation (or action potential). (b) Summation is a graded muscle contraction produced as a result of stimulation of the muscle fiber before it can relax. The new stimulation rides as a “piggybank” on the previous stimulation. (c) Tetanus is a sooth, sustained muscle contraction that results when a muscle fiber is stimulated so rapidly that it does not have a chance to relax between stimuli. 2.) Tetany ; hypocalcaemia and alkalosis[2]. 3.) Twitch is produce when a muscle fiber is stimulated by a single action potential. A stimulated muscle fiber relaxes after the contraction has taken place. If, the muscle is stimulated a second time before it can relax from the first twitch , a second action potential is produced. The second action potential causes second contraction, which is added as a “piggybank” to the first twitch. This produces a greater tension in the fiber than a single action potential. Variations in the strength of muscle contractions are produced by changing the frequency with which the muscle is stimulated. If the frequency of the stimulation is low, only single action potential is produced which causes a weak twitch in the muscle. If however, the frequency is slightly increased, summation results which is stronger than a twitch. To produce even stronger muscle contractions, frequency is increased even higher. This results in smooth contraction tetanus, which is
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lab3 - Ex.- 5.2 1.) (a) Twitch is a response of skeletal...

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