H U M A N     B O D Y

 

Muscular System

 

The muscular system allows the body to move. It consists of 639 muscles and tendons which are bands of tough, inelastic fibrous tissue that connects a muscle with its bony attachment.

The muscular system is controlled by the nervous system.

 

Jobs of the muscular system

Strength:

Provides strength for the body

Balance:

Provides balance for the body

Posture:

Gives posture to the body

Movement:

Allows the body to move

Heat:

Provides heat for the body to keep it warm

 

Types of Muscles

Cardiac:

These are the muscles of the heart. They are controlled by the autonomic nervous system. They are involuntary and can't be controlled by human thought.

Smooth:

These are also controlled by the autonomic muscle system and are involuntary. The intestinal muscles are smooth muscles.

Skeletal:

Skeletal muscles are striated or "striped". They are voluntary muscles and can be controlled by conscious thought. Macles in the arms and lets are examples of skeletal muscles. A further subdivision are the extensor and flexor muscles. An extensor muscle is a muscle that works to extend or straighten a body part, effectively enlarging the angle between body parts. Examples of extensor muscles include the muscles that straighten the elbow or the knee. The opposite equivalents of extensor muscles are flexor muscles, which work to close a joint, for example to bend the arm at the elbow or the leg at the knee.

 

Anterior Muscles Diagram

Anterior Muscles Diagram

 

Muscular System Videos

Muscular System Quiz

 

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