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 –a–attached to bone and control bodily movement –S–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

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 –S–Symptoms: stiffness, numbness, depression –C–Cause- unknown, but stress, and poor fitness affect the condition

Diseases Continued.. Muscular Dystrophy –G–Group of inherited diseases that causes progressive muscle atrophy –A–Appears in early childhood –P–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!