A. Twitch Contraction 1. A muscle twitch is the smallest...

A. Twitch Contraction 1. A muscle twitch is the smallest unit of contraction. 2. The three phases of a twitch on a myogram recording include the following: a. Describe what happens during the latent period b. Describe what happens during the contraction period. c. Describe what happens during the relaxation period.

Transcript

00:01 Hello student here the question is given and the question is about this muscle twitch so this can be a type of spontaneous so here we can say this muscle twitch is a spontaneous and brief contraction so here a single action potential a single action potential from a motor neuron will produce a single contraction in a muscle fiber of its motor unit motor unit so this isolated contraction is called as twitch so a twitch can twitch can last for few millisecond and few millisecond or it could be also up to the hundred milliseconds or it could also up to this hundred millisecond so here similarly the next part is depending on the muscle type it is going to be out for a few millisecond or it could last up to the hundred millisecond similarly the next part a question is about this latent period so as we can see here this there are three different period latent period and this contraction as well as the relaxation so the latent period is the one which is the short delay and this short delay around one to two millisecond you can see here and from the time when the action potential reaches to the muscle so this is going to be from time when the action potential reaches to the muscle until this tension is going to be absorbed in the muscle so the single stimulus is going and when this action potential reaches to that particular muscle so this is the time required for calcium to diffuse out of this sr so here it is the we can say this is the time for this required for this calcium to diffuse out from the sarcoplasmic reticulum and then bind with this troponin and then moment of this tropomyosin is going to be off from the active side and the cross -brace formation is taking place so this one is a latent period and this ranges from one to two millisecond and the similarly the second part of this is about this contraction phase so as we can say this contraction period or phase is when the muscle is generating the tension so this one is about the muscle when involved in generating this tension and it is associated with the cycling of cross braces so this is associated with the cycling of this cross bridge and next one is this relaxation phase or relaxation period so this one is relaxation phase or period so this is the time of for the muscle to return to its normal length so the length of the twitch is going to be vary between the different type of muscles and it could be as a short as this 10 millisecond or it could be a long and the long as 100 millisecond so this is the depending on the type of muscle and these three different phases are the period is present in case of twitch...

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