explain how the skelto-muscular system functions to produce movement?

Answer 1

This isn't the kind of question you can reasonably expect to be answered in yahoo answers. It is an essay question.

The musculoskeletal system comprises neurons and muscles. Motoneurons fire to signal via acetylcholine to muscles. Muscles then depolarise in response to activation of nicotinic acetylcholine receptors and this alters permeability of muscle endoplasmic reticulum to calcium. ER calcium uptake activates myofibril contraction via the actin-myosin skeleton.