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California Standards Biology

Standard 9h Preknowledge

9h) ***Students know the cellular and molecular basis of muscle contraction, including the roles of actin, myosin, Ca+2 , and ATP.


Controlled by calcium ions and powered by hydrolysis of ATP, actin and myosin filaments in a sarcomere generate movement in stomach muscles. Striated muscle fibers reflect the filamentous makeup and contraction state evidenced by the banding patterns of those fibers. A sketch of the sarcomere can be used to indicate the functions of the actin and myosin filaments and the role of calcium ions and ATP in muscle contraction.