-The muscular system is responsible for the movement of the human body
-Attached to the bones of the skeletal system are about 700 named muscles that make up roughly half of a person’s body weight.
-Muscles move by shortening their length, pulling on tendons, and moving bones closer to each other
-Each of these muscles is a discrete organ constructed of skeletal muscle tissue, blood vessels, tendons, and nerves.
-Muscle tissue is also found inside of the heart, digestive organs, and blood vessels.
-Tendons are tough bands of dense regular connective tissue whose strong collagen fibers firmly attach muscles to bones. Tendons are under extreme stress when muscles pull on them, so they are very strong and are woven into the coverings of both muscles and bones.
3 types of muscles...
1. Visceral muscle is found inside of organs like the stomach,, intestines, and blood vessels. The weakest of all muscle tissues, visceral muscle makes organs contract to move substances through the organ.It is also an involuntary muscle.
2. Cardiac muscle is responsible for pumping blood throughout the body and is only found in the heart. It is an involuntary muscle.
3. Skeletal muscle is the only voluntary muscle tissue in the human body.The function of skeletal muscle is to contract to move parts of the body closer to the bone that the muscle is attached to. Most skeletal muscles are attached to two bones across a joint, so the muscle serves to move parts of those bones closer to each other.