Answer Happy

Fatigue: Tetanus cannot continue forever. With continued rapid stimulation, there is a build-up of acidic compounds which affect protein functioning, a relative but not total lack of ATP, and ionic imbalances resulting from membrane activities. This causes muscle fatigue and the gradual inability of the muscle to respond to stimulation. Note that with treppe, the muscle relaxes after each stimulus. With temporal summation and incomplete tetanus, the muscle never really relaxes totally, and with complete tetanus, the muscle stays contracted. With fatigue, the muscle slowly loses its tension. Graph of Multiple Stimuli - Label the five parts to this graph: Factors Affecting Muscle Tension: 2. Number of Motor Units Recruited Muscle tension can also be increased by increasing the number of motor neurons that are sending signals to the muscle, called spatial summation.
● ● ● Each different muscle has different actual time periods for each phase. The speed with which the contraction phase occurs depends on ● the weight of the load being lifted the type of fibers contracting (slow-twitch fibers or fast-twitch fibers) Label the three phases of muscle twitch on this diagram: ● Tension (g) 0 20 40 60 80 100 Time (ms)