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I am not sure if you are referring to a mechanochemical cycle of "stepping" of a myosin molecule along an actin filament, or a cycle of contraction and relaxation of a muscle cell as a whole. These take place on completely different timescales and control the binding and unbinding of the two proteins in entirely different ways. In the ...


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The pectoralis major is not just an adductor and medial rotator of the arm. Its clavicular fibres also flex the arm at the glenohumeral joint. This is the action useful in performing push-ups and bench presses. And yes, its adductor action also plays a role in pull-ups and climbing (along with that of the latissimus dorsi, another adductor). References and ...


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