Muscular System

By your fellow classmates, Zach Thurston and Brad Benson

• There are over 600 muscles in the human body!

• Muscles are bundles of muscle fibers held together by connective tissue

Three Kinds of Muscles

• Visceral– smooth muscle found in internal organs of the

body such as digestive and respiratory contract to cause movement in these organs

– Visceral muscles are involuntary, meaning they move without conscious thought

Three Kinds of Muscles

• Cardiac– Forms walls of the heart and contracts to

circulate blood– Cardiac muscles are also involuntary

Zach The “Macho Man”

Three Kinds of Muscles

• Skeletal muscle – attached to bone and control bodily

movement– Skeletal muscles are voluntary, meaning they

move by conscious thought

Brad, A.K.A.

“The Wind”

Important functions

• Attach to bones to provide to provide movement

• Produce heat and energy for the body

• Help maintain posture• Protect internal

organs

Different Muscle Movements

• Adduction-moving toward the midline

• Abduction- moving away from the midline

• Flexion- decrease angle between two bones

• Extension- increase angle

• Rotation- turning around an axis

• Circumduction- moving in a circle at a joint

Different Muscle Movements

• Partial contraction- muscle tone or readiness to act loss of muscle tone can occur because of paralysis

• When muscles aren’t used for a long period of time they atrophy( shrink)

• Contracture- sever tightening of a flexor muscle

Muscular Diseases

• Fibromyalgia

• Muscular Dystrophy

• Myasthenia

• Cramps

Diseases

• Fibromyalgia- widespread pain in specific muscle sites– Symptoms: stiffness, numbness, depression– Cause- unknown, but stress, and poor fitness

affect the condition

Diseases Continued..

• Muscular Dystrophy– Group of inherited diseases that causes

progressive muscle atrophy– Appears in early childhood– Physical therapy slows the process down

Even more diseases..

• Myasthenia gravis– Nerve impulses aren’t transmitted correctly to

muscle• Leads to weakness and paralysis

Thought to be an autoimmune disease

The Last of our “Diseases”

• Cramps– Sudden muscle contractions usually in legs or

side– Provide gentle pressure to ease the pain

THE END

.. OR IS IT?

….. OR IS IT NOT SO?

YEA, IT IS

Happy January 6!