ANATOMY

Detailed explanation-1: -Muscle tissue is composed of cells that have the special ability to shorten or contract in order to produce movement of the body parts. The tissue is highly cellular and is well supplied with blood vessels.

Detailed explanation-2: -Each strand is made up of sub-units called “sarcomeres.” These sarcomeres contain the “contraction proteins” called actin and myosin. The chemical interactions of these two proteins are responsible for the abilities of the muscle to contract (shorten), relax and produce force (necessary to move the body or objects).

Detailed explanation-3: -Contractility is the ability of muscle cells to forcefully shorten. For instance, in order to flex (decrease the angle of a joint) your elbow you need to contract (shorten) the biceps brachii and other elbow flexor muscles in the anterior arm.

Detailed explanation-4: -Skeletal muscle is attached to bones and its contraction makes possible locomotion, facial expressions, posture, and other voluntary movements of the body. Forty percent of your body mass is made up of skeletal muscle.

Detailed explanation-5: -Muscle tissue also has the quality of extensibility; it can stretch or extend. Following contraction or extension, a muscle can return to its original length when relaxed due to a quality of muscle tissue called elasticity.