Answer :
As the frequency of muscle action potentials Increased the strength of the resulting muscular contraction summation .
Twitch, summation, and tetanus are three main categories that describe the intensity of skeletal muscular contractions. An action potential generated within the muscle fibre itself causes a single contraction and relaxation cycle, which is known as a twitch. The amount of force generated by a muscle varies depending on how many motor units are functioning at once. Elwood Henneman and his Harvard Medical School colleagues discovered in the 1960s that continuous increases in muscular tension may be induced by gradually raising the activity of axons that serve as input to the pertinent population of lower motor neurons. The recruitment of the motor units in a fixed order based on their size is what causes this gradual increase in tension.
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