The muscular system helps the body to move around. It's what makes the body walk, jump, hold, look, point many other things.
There are three main types of muscle tissue, smooth, cardiac, and skeletal. Smooth muscle cells are in the walls of visceral organs, except the heart. The heart has tissue made up of cardiac cells. The skeletal muscle cells are in muscles that are attached to bones, like our biceps and abs.
These are some of our bodies major muscles. They are the pectoralis, biceps, quadriceps, deltoid, tibialis anterior, and the frontalis.
To help move, the muscles work in pairs. For example, to move the arm up and down, the bicep will flex while the triceps relaxes, and vice versa.
Muscles can not push, only pull. Muscles make up 40% of our body weight. Humans are born with all the muscle fibers they will ever have. Our body has over 600 muscles. It takes 17 muscles to smile, and 43 to frown!