MUSCLE SYSTEM

MUSCULAR SYSTEM

• There is over 600 muscles that make up the muscular system.
• Muscles are bundles of muscle fibers held together by connective tissue.

PROPERTIES OF MUSCLES

• Excitability is the ability to respond to a stimulus.
• Extensibility is the ability to be stretched.
• Contractibility is the ability to become short and thick.
• Elasticity is the ability to return to its original shape.

MAIN KINDS OF MUSCLES

• There are three main kinds of muscles: cardiac, visceral, and skeletal.
• Cardiac muscles form the walls of the heart and contracts to circulate blood.
• Visceral muscles are found in the internal organs of the body and contracts to cause movement in these organs.
• Skeletal muscles attach to the bones to provide movement and protect internal organs.

FUNCTION OF SKELETAL MUSCLES

• Attach to bones to provide voluntary movement.
• Produce heat and energy for the body.
• Help maintain posture by holding the body erect.
• Protect internal organs.

There are two ways that skeletal muscle can attach to bones one is tendons.

The other way that skeletal muscles attach to bones is fascia.

DISEASES

• Fibromyalgia is chronic, widespread pain in specific muscle sites.
• Muscular Dystrophy is actually a group of inherited diseases that lead to chronic, progressive muscle atrophy.
• Myasthenia Gravis is a chronic condition where nerve impulses are not properly transmitted to the muscles.
• Muscle Spasms are sudden, painful, involuntary muscle contractions.
• A strain is an over stretching of or injury to a muscle and or tendon.