There are 3 different muscle types that have different functions. They are called skeletal, smooth, and cardiac muscles. Skeletal is used for keeping your body upright and stable. Smooth muscle is used for pushing urine or babies out and also makes food flow down the right track. And finally the function of cardiac muscles is to pump the heart using contractions. Muscle contractions happen when the thick myosin and thin actin slide past each other. Myofibril is also a major part of contractions and give the muscle that striped look. The function of a flexor muscle is to decrease the angle for bones, for example bending your knees and elbows. Extensor muscles are similar except instead of decreasing the angle it increases it just like bending
