Question
How does a muscle return to its original form during relaxation? Also draw a diagram showing relaxation of muscle. What causes muscle fatigue?
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Answer
- The calcium ions after contraction are quickly pumped back to the sarcoplasmic cisternae. This leads to blocking of active sites on actin. The Z-line returns to the original position. Causing muscles to return to its original position, i.e., relaxation form.
- Repeated activation of the muscles leads to accumulation of lactic acid due to anaerobic breakdown of glycogen in them which causes fatigue.
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