Bones And Skeletal Muscles example essay topic

Muscle is almost half the body's weight. Muscles are the part of our body that allows us to move. They are attached to the bone by tendons and other tissues. When the muscles contract, they pull on the tendons that pull on the bones and cause our limbs to move. There are more than 640 muscles, and they hardly ever work alone. Muscles can get shorter and pull, but they cannot push.

The way they work is as a team. They pull the body part one way, then the other part pulls it back again; therefore, as on part of the team relaxed the other stretches. Also there is three different type of muscle the cardiac muscle, the smooth muscle and the skeletal muscle. The cardiac muscle located in the heart, acts like rhythmic smooth muscle, modulated by neural activity and hormones. Cardiac muscle contract automatically to squeeze the walls of the heart inward. The heart beats nonstop about 100,000 times each day.

This movement is involuntary. Cardiac muscle is also striated like skeletal muscle, which means that it has microscopically visible myo filaments arranged in parallel. Another difference in cardiac muscle is the presence of intercalated disc that are specialized connections between one cardiac muscle cell and another. These tight connections allow for almost completely free movement of ions so that action can freely pass from one cell to another.

The skeletal muscle is the one that move us around and is responsible for most of our behavior, most attached to bones at each end via tendons. In general what the skeletal muscle does is the support of the skeleton. They make up 50 percent of our body weight. There are 640 individually named skeletal muscles. When these muscle contract or shorten our bones moves. Muscles are arranged in layers over the bones.

Those nearest to the skin are called superficial muscles and those closed to the inside of the body are called deep muscle. The skeletal muscles are voluntary muscle. The smooth muscle which is the last type of muscle in the muscular system in controlled by the autonomic nervous system; may either be generally inactive and then respond to neural stimulation or hormones or may be rhythmic. The muscular system has several functions and importance. The integrated action of joints, bones and skeletal muscles produces movements such as walking and running. Skeletal muscle also produces movements that result in various facial expressions like eye movement and respiration movement.

Other functions in the body are posture, joint stability and heat production. In general the muscular system is important in our body system just like the other system in the rest of the body..