Compare and contrast frequency-dependent wave summation with motor unit recruitm

Wave summation releases more calcium and increases the force of contraction by increasing the firing rate of motor neurons using one muscle fiber. Recruitment use multiple motor units, in order to increase the force of contraction. There is no added calcium ions as in wave summation. They usually occur together. wave summation can cause tetanus, while recruitment cannot. Summation was achieved by firing stimuli over and over before relaxtion of the muscle causing more force recruitment was achieved by rapid firing of stimuli to get max sooner.