are about 650 muscles in the human body.
are made of fibers that enable them to shorten and lengthen, producing movements.
Tendons connect muscles to bones.
muscles make up about one half of your body's weight.
are three main types of muscles: skeletal, smooth and cardiac.
move your bones. These are the muscles that we can see and feel. Skeletal muscles
attach to the bones through tendons. They come in pairs -- one muscle to move
the bone in one direction and another to move it back the other way. Skeletal
muscles are voluntary muscles. Meaning, that you think about contracting them
and your nervous system tells them to do so. Skeletal muscles can perform two
types of contractions: short single contractions (twitch) and long, sustained
found in the internal organs (digestive system, blood vessels, bladder, airways
and, the uterus). Smooth muscle has the ability to stretch and maintain tension
for long periods of time. Smooth muscles move involuntary. You do not have to
think about movement for movement to occur.
muscle is found
only in your heart. Cardiac muscle is also an involuntary muscle. It can stretch
in a limited way, like smooth muscle, and contract with the force of a skeletal
muscle. Cardiac muscle is a twitch muscle.
common muscle injuries are strains, sprains,
cramps (charley horse), and repetitive