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The mylohyoid elevates the hyoid and the tongue. This is particularly important during swallowing and speaking. Alternatively, if other muscles are used to keep the position of the hyoid fixed, then the mylohoid depresses the mandible. It also functions as reinforcing the floor of mouth. This muscle is supplied by inferior alveolar nerve (branch of mandibular nerve). See more about this muscle here Mylohyoid muscle - Wikipedia. You can find the function of any other muscle in the same way, more easily than asking on Quora and awaiting answers that may or may not be right.
This process is known as the sliding filament model of muscle contraction because the actin filaments slide over the myosin filaments. The muscular system works with the nervous system to produce the contraction. Neurons (nerve cells) form connections to one or more muscle cells. A chemical, acetylcholine, is released when an impulse is sent which allows the myosin-actin bridge to form.