actin

troponin actin

tropomyosin troponin actin

tropomyosin troponin actin

myosin binding site tropomyosin troponin actin

Ca2+ Ca2+ Ca2+ Ca2+

Ca2+ Ca2+ Ca2+ Ca2+ Calcium ions are released from the sarcolemma after stimulation from the T system

Ca2+ Ca2+ Ca2+ Ca2+

the calcium ions bind to the troponin and changes its shape

the calcium ions bind to the troponin and changes its shape

Ca2+ Ca2+ Ca2+ Ca2+

Ca2+ Ca2+ Ca2+ Ca2+

Ca2+ Ca2+ Ca2+ Ca2+ the troponin displaces the tropomyosin and exposes the myosin binding sites

Ca2+ Ca2+ Ca2+ Ca2+

Ca2+ Ca2+ Ca2+ Ca2+

Ca2+ Ca2+ Ca2+ Ca2+ the bulbous heads of the myosin attach to the binding sites on the actin filaments

Ca2+ Ca2+ Ca2+ Ca2+

Ca2+ Ca2+ Ca2+ Ca2+

Ca2+ Ca2+ Ca2+ Ca2+ the myosin heads change position to achieve a lower energy state and slide the actin filaments past the stationary myosin

Ca2+ Ca2+ Ca2+ Ca2+ A Pi A Pi A Pi

A Pi Ca2+ A Pi Ca2+ A Pi Ca2+ Ca2+

ATP binds to the bulbous heads and causes it to become detached Pi Ca2+ A Pi Ca2+ A Pi Ca2+ Ca2+ ATP binds to the bulbous heads and causes it to become detached

ATP binds to the bulbous heads and causes it to become detached Pi A Pi A Pi Ca2+ Ca2+ Ca2+ Ca2+ ATP binds to the bulbous heads and causes it to become detached

hydrolysis of ATP provides the energy to “re-cock” the heads Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ Ca2+ Ca2+ Ca2+ hydrolysis of ATP provides the energy to “re-cock” the heads

hydrolysis of ATP provides the energy to “re-cock” the heads Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ Ca2+ Ca2+ Ca2+ hydrolysis of ATP provides the energy to “re-cock” the heads

Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ Ca2+ Ca2+ Ca2+

calcium ions are re-absorbed back into the T system Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ Ca2+ Ca2+ Ca2+ calcium ions are re-absorbed back into the T system

calcium ions are re-absorbed back into the T system Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ calcium ions are re-absorbed back into the T system

Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ the troponin reverts to its normal shape and the tropomyosin move back to block the myosin binding sites

Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ the troponin reverts to its normal shape and the tropomyosin move back to block the myosin binding sites

Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ the troponin reverts to its normal shape and the tropomyosin move back to block the myosin binding sites

phosphocreatine regenerates ATP Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ phosphocreatine regenerates ATP

phosphocreatine regenerates ATP Pi Pi Pi A Pi Pi Pi Pi A Pi Pi A Ca2+ phosphocreatine regenerates ATP

phosphocreatine regenerates ATP Pi Pi Pi A Pi Pi Pi A Pi Pi Pi A Ca2+ phosphocreatine regenerates ATP

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