Frog Gastroenemius Muscle Lab Report Graphs: M ake sure you collect data to cons

Question

Frog Gastroenemius Muscle Lab Report Graphs: M ake sure you collect data to construct the following graphs. Part 1.Stimulus (volts) vs Tension developed (grams) Part 2 Stimulus frequency (Hz) vs Tension developed (grams) Part 1. Twitch Responses Maximal voltage 6 Threshold voltage Force generated Duration of twitch contraction o.5s Duration of twitch contraction c.6S Latent period (time from stimulus to twitcha ay s Latent period 0-0 4 Force generated _a.so . Describe the events taking place that result in the "latent period," the time from stimulating the nerve to muscle contraction. 2. What do you think is happening as you increase voltage from threshold to the maximal voltage? Why does the force generated by the whole muscle increase? (Remember the sciatic nerve is a bundle of axons).

Explanation / Answer

1. The period between when stimulus effects on sensory nerve and response of it

2. If we increase the voltage from threshold to the maximum voltage the muscle wiil still contract with the same force.Force generated by a muscle is basically depends on the total number of cross-bridges attached, as it takes a finite amount of time for cross-bridges to attach, as filaments slide past one another faster and faster (i.e., as the muscle shortens with increasing velocity), force decreases due to the lower number of cross-bridges attached. while , as the relative filament velocity reduces (i.e., as muscle velocity decreases), more cross-bridges have time to attach and to generate force, and thus force increases. This discussion is not meant to provide a detailed description of the basis for the force-velocity relationship, only to provide insight as to how cross-bridge rate constants can affect muscle force generation as a function of velocity.

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