Question

Explain the initiation of muscle contraction ?

Answer 1

The function of Sarcoplasmic reticulum is to releases calcium.
During resting stage of muscle the thin filaments and thick filaments are apart (seperate),
where the myosin binding sites with actin filament are blocked.

During contraction (excitation) process, calcium molecules binds with actin (thin) filament and
initiates the binding of Myosin (thick) filament with Actin (thin) filament
finally leading to muscle contraction.