Amazing facts about muscular system

1.there are muscles in the root of the hair that gives us goose bumps,.
2.Muscles can account for about 40% to 50 % of our weight.
3.the biggest muscles in the human body is the gluteus maximus. our butt.
4.it takes 17 muscles to smile and Fourty three muscles to frown.
5.Muscles can contract ,pull and relax but they cannot push or stretch themselves.
6.The most hardworking muscles is the cardiac muscles and heart beat about 100,000 

times in one day..
7.The tough is the strongest muscles in the human body..
8.we actually use 200 muscles for taking only one single step..
9.eye muscles are the very busiest museles in the human body..
10.Muscles have their own memory.that's way when you learn how to ride a bike you can never forget it ,no metter hoe long you have not
done it..