All muscle and parts play a vital role in human body .
1 lungs for provide oxygen to blood cells otherwise out blood cells will die
2 Liver to produce biles which help digest food and make you feel hungry produce energy
3 gallbladder is used to store your biles for quick digestion
4 stomach is used to store your food and later on produce juice for digestion
5 pancrease refine your sugar and produce energy
6 kidney is to purify your blood and make urine for clean your body put out all poisons and toxins out from your body.