Although the details of how it actually occurs at still unknown, muscles react to resistance or weight training by becoming stronger and usually larger. The important point is that weight lifting stimulates growth; in other words, the growth does not occur in the gym but afterwards during recovery as your body adapts to the increased demands you have put on it.
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No always lifting heavy weight helps builds muscles. Doing many reps with more managble weights for you is a lot better then trying to do next to no reps with a weight that is way to heavy for you.
When you lift weights, you tear your muscles; but only micro tears. when your body heals these micro tears it patches them over with muscle fibers constructed by protein. These "muscle patches" are larger than the original tears themselves, so in effect, the muscle get larger.
muscles and other assistant tendons in the human body .
in the factory there what they call it Roller , which pull the the heavy weights and elevate it .