What are muscles?
Muscles are tissues which could settlement and go back to their normal length. A muscle is made of thread-like proteins in our body. We have about 650 muscle tissues. These muscle mass are related to bones, gentle tissues which include cartilage and ligaments, and to skin. The muscle tissue in our hands and legs are long. Our chest muscle mass are extensive and flat. Our facial muscle mass permit us to expose our emotions thru expressions. We have more facial muscle mass than every other animal. Muscles are voluntary or involuntary. The voluntary muscle tissue circulate while we need them to. The involuntary muscle tissue, along with the cardiac muscle groups in our hearts, flow on their own.
