Frog Muscle Disection Essay

809 Words Oct 14th, 2014 4 Pages
1. As you increase voltage to the muscle describe how it responds to the increased stimulus.
As the voltage was increased from threshold to maximum voltage, there was a greater force in the muscle contraction. Once the maximum voltage (2500 mv) was reached, even if there was an increase in voltage, the force of the muscle contraction remained the same.

2. What was the smallest voltage required to produce a contraction (the threshold voltage)? What proportion of the fibers in the muscle do you think were contracting to produce this small response?
0.2500V , a small contraction of all the muscle fibers

3. What was the smallest voltage required to produce the maximum (largest) contraction? What proportion of the fibers in the
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Increases in force as it stretches.

7. What effect does stretching the muscle have on contraction strength? Is this effect linear?
The further the muscle is stretched the bigger the force it exerts. This is a linear effect.

8. What stretch resulted in the highest contraction force? What happens to the muscle at the highest stretch levels?
The 10mm stretch. It contracts more vigorously.

9. Describe how the isolated muscle behaved as the stimulus interval was decreased progressively.
As the intervals were reduced the twitches got closer together. Each curve, which represents a response to the stimuli, got closer until they finally became one. This represents summation which is when the muscle is unable to completely relax before the next stimulus occurs. As a result, individual twitches begin to combine, and the contraction becomes sustained.

10. How does varying the frequency effect contraction force? Which interval caused the greatest contraction?
The shorter the intervals the greater the force. The 20ms interval causes the greatest force.

11. Describe how the isolated muscle behaved as the stimulus interval was further decreased. As the intervals were reduced the twitches got closer together. Each curve, which represents a response to the stimuli, got closer until they finally became one. This represents summation which is when the muscle is unable to completely relax before

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