Write the schematic presentation of muscle contraction?

Explanation

`{:("Muscle contraction is initiated by the signal"),(" form CNS"),(" "darr),(" Release of acetylcholine at the"),(" neuromuscular junction"),(" "darr),(" Causes action potential in muscle fibre"),(" "darr),(" Triggers the release of calcium ions from"),(" sacroplasmic reticulum"),(" "darr),(" Calcium ions combine with troponin and"),(" tropomyosin uncovers the binding sites on"),(" actin and initiates contraction"),(" "darr),(" Myosin binding sites on actin exposed."),(" Myosin head binds to actin"),(" "darr),(" Myosin head executes power stroke."),(" "darr),(" Actin filament slides towards the centre of"),(" sarcomere (contraction)"),(" "darr),(" Signal from CNS stops, calcium ions"),(" are pumped back into the sarcoplasmic"),(" reticulum"),(" "darr),(" Tropomyosin masks the binding sites."),(" Filaments pulled back to the original"),(" position (relaxation)"):}`