Human Muscles and It Types

Human Muscles and It Types

What are muscles

A muscle is an elastic body which after twisting, stretching, squeezing, and turning moves back to the original length. They are mobilized and pulled to produce movement.

Muscles are the-fleshy parts of our body: they cover the skeletal system and gives the body its shape. The collectiveness of muscles of the body is called the muscular system. Muscles only act under the influence of the nerves.

Some Muscular movements Include;

  • The blinking of the eye
  • Raising the hand
  • Pumping of the blood by the heart
  • Squeezing of food through the alimentary canal.

The muscles bring about their movement by means of their attachment to hones or cartilage which acts as levers

Types of Muscles
  1. Cardiac Muscles
  2. Skeletal Muscles [The Voluntary]
  3. Smooth Muscles [The Involuntary]

{1} Cardiac Muscles

This is only found in the hearth. The muscles of the hearth are, as a rule, grouped as involuntary muscles as they are under the control of the autonomic nervous system. Cardiac muscles contract rhythmically, even without nervous stimulation, but the rhythm is normally controlled by a nervous impulse received from the especially sensitive cardiac muscle fibers

{2} Skeletal Muscles [The voluntary]

They are also called skeletal muscles because they are usually attached to bone either directly or indirectly. They are controlled by the voluntary parts of the nervous system and is composed of large striated cells bound together into bundles. They are capable of fast, powerful movements. Voluntary muscles are attached to the skeleton by a strong fibrous band called tendons.

Each muscle is fastened at one end of the fixed bone. This points of attachment are called the point of origin. On the other hand, at the other end, it is fastened to the bone to be moved. This point is called the point of insertion. When the muscle contracts or shortens, cause the bone into which it is inserted to move.

[3] Smooth Muscles [The voluntary]

The function of such muscles is not controlled by will. They move automatically because they receive the nerve supply from the autonomic nervous system. These are the muscles of the diaphragm, the alimentary canal, etc.

Their contractions are very slow and can be kept up almost indefinitely. These muscles squeeze food through the alimentary canal, contract to help push blood through the arteries, control the release of urine and perform various other activities that are essential survive.

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