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Also attached or surrounding the actin myofilaments are tropomyosin and troponin into which the tropomyosin molecules are embedded.Each myosin myofilament is surrounded by six or more actin myofilaments.

Skeletal muscles can be stretched up to 150% of their resting length.Peak rate ot muscle contraction is dependent on myosin ATPase activity and the size of the motor neuron.Maximal force or tension a muscle can generate is dependent on the amount of actin-myosin binding taking place.After depolarization, repolarization occurs as potassium ions move to the outside of the cell to regain the -70 millivolt resting membrane potential.Then the sodium-potassium pump restores equilibrium. Proprioceptors are muscle spindles, (located in intrafusal fibers parallet to extrafusal fibers) Golgi tendon organs, and Pacinian corpuscles (sensory).

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NYU Professor Julia Evergreen Keefer This is an Anatomy and Kinesiology, not Physiology class.