Question

what is muscle contraction ?

Answer 1

muscle contraction is the activation of tension- generating sites within the muscle fibers

Answer 2

Pura padhna...

vrna isme tera ghata mera kuch nhi jaata..

:)

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...

#Khushi here