Why do we need muscle? Describe the different kinds of muscle in a human body
So we can move.
Without muscles, we wouldn't be able to move any joint. When you bend your elbow, you need muscles to move it. Some muscles are the wrist flexor (in your wrist), bicep (in the top of your arm), triceps (below your bicep), quadriceps (in your thy), and many, many more muscles in your body.