The release of calcium by the sarcoplasmic reticulum begins the contraction phase of a twitch contraction.
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Q60: Actin,troponin,and tropomyosin are present on the thick
Q61: Tetanus will not occur in an individual
Q62: Myosin heads release from the actin molecule
Q63: When troponin and calcium combine,it causes actin
Q64: The difference between red and white fibers
Q66: Because of the elasticity of the muscle
Q67: The sarcoplasmic reticulum in muscle cells is
Q68: The A-band in a relaxed sarcomere is
Q69: T-tubules are formed by an inward extension
Q70: When the sarcomere contracts,the A-bands become smaller.
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