What will happen to the height of the single muscle twitch w

What will happen to the height of the single muscle twitch, when you increase the stimulus intensity? If it increases as the stimulus intensity increases, how does the increase occur? Is it a gradual change or all-or-none response? What about the expected time course of a single muscle twitch? How long will it take, and how does the curve look like?)

RATIONALE for your ideas about the expected results: explain the mechanism of how the muscle (gastrocnemius) exhibits two “thresholds” in a single muscle twitch experiment.)

Experiment 2. Length-Tension relationship (muscle preparation)

Expected RESULTS: (what will happen to the force of muscle contraction when you manipulate the muscle length by gradual stretching?)

RATIONALE: (describe the mechanisms for these changes in the force of muscle contraction.)

Experiment 3. Summation and tetanus (muscle preparation)

Expected RESULTS: (what will happen to the height of the muscle twitch when the frequency of the multiple stimuli increases?)

RATIONALE: (explain possible mechanisms for this change.)

Solution

A twitch is a quick contraction of muscle when the stimulus is its high intensity/threshold. A single twitch in a muscle is a response to a single stimulus. If the threshold intensity increases, the twitch increases. If stimuli have been closer, the stronger the twitches have been. 10 Stimuli per second if get produced it leads to a treppe. The twitch has been stronger than the one before within a treppe. Treppe shows the wave pattern of stimuli with contraction and relaxation. Between a twitch to twitch, a small few seconds of latent period could be observed. The response to a stimulus is based on all-or-none response. If the stimulus has been in its threshold, then only response for a stimulus could be seen.