Human Physiology Lab Report on Nerve Conduction, biology homework help

Answer the following in a lab report:

1. Graph the amplitude of the muscle response as a function of the stimulus amplitude using the chart below

Stimulus Amplitude (A)

Muscle Response (V)

0.0

0.000

0.5

0.000

1.0

0.000

1.5

0.000

2.0

0.000

2.5

0.000

3.0

0.004

3.5

0.008

4.0

0.008

4.5

0.009

5.0

0.009

5.5

0.009

6.0

0.009

6.5

0.009

7.0

0.009

7.5

0.009

8.0

0.009

8.5

0.009

9.0

0.010

9.5

0.009

10.0

0.009

2. Based on the figure you generated for “1” above, what is the relationship between stimulus
amplitude and muscle response? Be specific about the shape of the curve.

3. Does the amplitude of the action potential in each fiber in the ulnar nerve increase or do the numbers of nerve fibers in the nerve that respond increase with increased stimulus strength?

4. Using position 1 (133mm), position 2 (110mm), time 1 (10.35msec), and time 2 (9.2msec), calculate the conduction velocity (in m/sec) by dividing the distance (in mm) between the two positions of the negative stimulating electrode by the time (T2-T1) between the peaks of the muscle responses from those two positions.

5. What is the conduction velocity of the ulnar nerve as previously (and reputably) reported?

6. How long is the human ulnar nerve? Is it myelinated?

7. At the nerve conduction velocity you calculated (or the velocity you found online if yours was off by an order of magnitude or more), how long does it take for an action potential to travel the length of the human ulnar nerve?

8. What’s the longest nerve in the human body?

9. For the above nerve, how long would it take an action potential to travel the length of that nerve if the conduction velocity were similar to the ulnar nerve?

10. Again for the above neuron, how long would it take an action potential to travel the length of that nerve if it were unmyelinated?

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