Muscular System By Katie Ust.

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Presentation transcript:

Muscular System By Katie Ust

Function The main function is to provide mobility, strength , head production, and shock absorption to the body

3 types of muscle Skeletal Muscle – moves us around and is responsible for behaviors. Attached to bones Cardiac Muscle – found in the heart. Acts like rhythmic smooth muscle Smooth Muscle - controlled by the autonomic nervous system. Can be inactive and respond to neural stimulation/hormones or can be rhythmic

Sliding Filament Model Calcium ions are released and bond to troponin. Myosin is used as a molecular motor and can then bind to passive actin filaments After a strong bond the two undergo isomerization ATP binds and allows myosin to detach from actin ATP hydrolysis recharges myosin head so it can bind to actin again

(Cont.) Sarcomeres are flanked by two actin filaments and are drawn in and shortened. Sarcomeres are connected by bridges which anchor actin filaments with reversed polarity Sarcomeres are arranged so they simultaneously contract so that force is transmitted to the fiber ends.

Muscular Dystrophy Muscles are greatly weakened and there is muscle loss Genetic disease Treatment includes physical and speech therapy, surgery, medications, but there is to cure.

Sources Epix.net/~tcannon1/physioweek4.htm En.wikipedia.org/wiki/Sliding_filament_model