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circular muscles or sphincter muscles
fascicles are concentrically arranged around an opening or a recess
guard entrances and exits of internal passageways such as the digestive and urinary tracts
levers can change
(1) the direction of an applied force (2) the distance and speed of movement produced by an applied force (3) the effective strength of an applied force
synergists that assist agonist by preventing movement at another joint and stabilizing the origin of the agonist
the formation of fibrous connective tissue; in muscles, the replacement of muscle tissue by fibrous connective tissue makes muscles weaker and less flexible
states that a muscle fiber will contract to its fullest extent once stimulated
In order for muscles to contract, the cross bridges must first do what?
attach to the actin filaments
Why do cross bridges not attach during relaxation?
because the sites for myosin attachment on the actin filaments are covered by tropomyosin attachment
What happens when Ca++ is absent?
The tropomyosin reverts back to its original position and blocks attachment
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