Which of the following will result in summation of twitch contractions in a skeletal muscle motor unit? Question 4 options: (a) Stimulating several action potentials in a motor neuron that are spaced 50 ms apart. (b) Stimulating two action potentials in a motor neuron that are spaced 50 ms apart. (c) Increasing the amplitude of a single action potential (d) answers (a) and (b) are both correct; answer (c) is incorrect (e) answers (a), (b) and (c) are all correct
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Contraction elicited by a single brief stimulus is called (a) a twitch, (b) temporal summation, (c) multiple motor unit summation, (d) fused tetanus.
Which of the following scenarios would be most likely to induce spatial summation in a whole muscle? A single pulse of supramaximal voltage is delivered directly to a single muscle fiber by a stimulating electrode. A stimulating electrode activates a single motor unit through the sciatic nerve, multiple times in rapid succession. A stimulating electrode activates multiple motor units through the sciatic nerve at the same time. A single motor unit is activated by a single electrical pulse from a stimulating electrode.
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