Everything begins when an action possible fires across a motor neurone, and leads to a discharge of a neurotransmitter known as acetylcholine to the thoracic area.
Myosin binds to such websites, and ADP release in the myosin filament contributes to a conformational switch (that leads to the filaments to slide across each other – that the “sliding filament” concept.
ATP binds to myosin and the bond has been broken, even however if there’s sufficient Ca, the myosin can seep into the actin back – and even additional “slipping” may happen. This occurs super fast and in series – LEADING TO MUSCLE CONTRACTION HORAAAY.
The Na movement in the extracellular space, throughout the cell membrane, and to the muscle cell cytoplasm is known as influx. This influx triggers depolarisation of the cell phone. [in case a positively charged ion such as Na moves to the mobile, then the membrane potential will grow more optimistic = ergo depolarisation].
Skeletal muscle (among the 3 forms of muscle in our body) contracts with excitation-contraction coupling, or even the sliding-filament theory.
The depolarisation induces voltage-gated Ca stations to start at the sarcoplasmic reticulum (would pull the t-tubules here in case needed/on syllabus). This causes a significant increase in concentration.
Acetylcholine results from the introduction of ligand-gated Na stations (these are small holes at the muscle cell membrane which are discharged once acetyl choline binds to these). The Na then melts to the cell since there’s a concentration gradient, based from the Na/K ATP pump.