Muscles and its three types

Muscles play important role in human body.
1. Without muscle, humans could not live. The primary job of muscle is to move the bones of the skeleton, but muscle also makes the heart beat and constitutes the walls of other important hollow organs.
2. Muscle is a soft tissue found in most animals. Muscles function to produce force and motion.
3. Muscle are primarily responsible for maintaining and changing posture, locomotion, as well as movement of internal organs, such as the contraction of the heart and the movement of food through the digestive system via peristalsis.
There are three types of muscle tissue:
1. Skeletal muscle: This type of muscle creates movement in the body. There are more than 600 skeletal muscles, and they makes up about 40 percent of a person’s weight. When the nervous system signals the muscle to contract, groups of muscles work together to move the skeleton.
2. Cardiac muscle: Cardiac muscle is involuntary muscle. This type makes up the walls of the heart and creates the steady, rhythmic pulsing that pumps blood through the body from signals from the brain.
3. Smooth muscle: Another involuntary muscle type, smooth muscle makes up the walls of hollow organs, respiratory passageways, and blood vessels. Like cardiac muscle, smooth muscle also contracts in response to stimuli and nerve impulses.