Chapter 6 Discussion

6.1 actin and myosin

6.2 remove calcium which requires ATP, troponin-tropomyosin shift back to original position preventing binding of actin and myosin, phosphate binds to  myosin to detach  from actin

6.3 summation - accumulation of effects, especially those of muscular or neural activity
      recruitment - increasing the tone (or force) of a muscle by activating more motor units
      tetanus - in a muscle a sustained maximal muscle contraction resulting from high-frequency stimulation