What causes muscles to contract?
Answers
Answer:
A single motor neuron is able to innervate multiple muscle fibers, thereby causing the fibers to contract at the same time. Once innervated, the protein filaments within each skeletal muscle fiber slide past each other to produce a contraction, which is explained by the sliding filament theory.
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Calcium is released from the sarcoplasmic reticulum at the time of muscle contraction ....
This calcium binds with Stark troponin I tropomyosin Complex on the actin filament molecules
the complex shifts and the myosin binding sites on actin filaments are exposed ...
Myosin head have actin binding sites as well as ATP sites..
Myosin head binds with the actin filaments and hydrolysis of ATP takes place that pushes the thin actin over the thick myosin filament ...
The thin filaments slide over the thick filament according to sliding filament theory...
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