Human Muscles Work

How do our muscles work?

Whether we are running waking lifting an object or just getting up from a couch, a number of muscles come into play. There are about 639 muscles of all shapes and sizes in the different parts of our body. A medium sized muscles of the body 10 million cells. All the muscles of the body put together have almost 6,000 millions cells. Each of these muscle cells is like a motor. Containing ten cylinders arranged in a row. The cylinders are tiny boxes that fountain fluid. A muscle contracts when the brain sends a message to these tiny boxes. For a fraction of second the fluid in the tiny box congeals and then returns to normal. It is this action that causes the muscles to move. Muscles make up to about 40% weight of the body.

Human Muscles Movements

            From birth to death, these muscles form a very important part of our life. They produce heat and help in the movement of food from one place to another in the digestive system. They take the air to the lunges. If they stop working all the factions of our body would come of halt. The throbbing of the heart and the expansion and contraction of intestines would also stop.

            The muscles of our body are of three kinds striated of voluntary smooth or involuntary and cardiac. Most of the muscles of the hands legs neck and head are voluntary because al these limbs function according to our wishes. Most of them are attached to nuns and are called skeletal muscles. Striated mussels are made up of many fibers. Smooth or involuntary muscles are those which functions on their functioning. The muscles of the stomach and intestine are involuntary because the process of digestion contours on ties own. These muscles help in blood circulation. The cardiac muscles are found in the heart. They are also involuntary muscles. They cannot be controlled by our will. It is most important muscle and is fibrous in structure. With the help of his muscle the heart beats 2,500 millions times in a life span of 70 days.

            Several body parts such as brain, spinal cord and nerves are involved in the working of muscles. A muscle is made up to of many tiny fibers that contract when they receive a signal from the nerve. Muscles fibers either only a few of its fibers contract the muscles contracts more powerfully when more of its fibers contract. All muscles work by contraction.

Why do We Shiver on a Cold Day?

            It is a matter of common experience that we shiver in winters if we are not wearing woolen clothes. And eve if we want to stop it. We cannot do much about it. Did you know why do we shiver on a cold day?

Shivering helps to keep our body warm

            Physiologically speaking, shivering is an automatic movement of the muscles. When we shiver our muscles tighten and relax very rapidly, over and over again. Each time our muscles contract, the muscle cells burn food to produce energy, with heat being the end result. Shivering is thus a mechanism that helps to keep the body warm. It keeps the body temperature from falling below a certain point. Sometimes, shivering is not enough to warm us up properly. You will find that it helps if you jump up and down or flap your arms on a cold day. This extra physical activity means more use of muscles, and more heat is produced in the body.

            We would not shiver if we do some exercise or play a physical game in cold weather. Physical activities make our muscles work hard and warm up the body. As such, shivering achieves the same effect without having to resort to any planned form of exercise.