Top-Rated Free Essay

Physio Ex 8.0 Exercise 3

Satisfactory Essays
Review Sheet
Exercise 3
Neurophysiology of Nerve Impulses

Eliciting (Generating) a Nerve Impulse
1. Why don’t the terms depolarization and action potential mean the same thing?
They require different things. Action potential requires depolarization and repolarization. Depolarization doesn’t require anything.

2. What was the threshold voltage in Activity 1? 3.0V

3. What was the effect of increasing the voltage? How does this change correlate to changes in the nerve?
The action potential increases.

4. How did the action potential generated with the unheated rod compare to the that generated with the heated rod?
The action potential increased with the heated rod.

5. Describe the types of stimuli that generated an action potential.
The glass rod and glass heated rod, the 3.0V and higher voltage, the sodium chloride, and the hydrochloric acid.

6. If you were to spend a lot of time studying nerve physiology in the laboratory, what type of stimulus would you use and why?
I would use the glass rod because I would like to see what the results might be if you froze the glass rod instead of heating it.

7. Why does the addition of sodium chloride elicit an action potential? Hint: Think about the sodium permeability of the neuron (Figure 3.2e).
Because of the addition of chloride.

Inhibiting a Nerve Impulse
8. What was the effect of ether on eliciting an action potential?
There was no action potential.

9. Does the addition of ether to the nerve cause any permanent alteration in neural response? yes 10. What was the effect of curare on eliciting an action potential?
There was action potential.

11. Explain the reason for your answer to question 10 above.
Because of the addition of the curare it reacted differently with the nerve.

12. What was the effect of lidocaine on eliciting an action potential?
There was no action potential.

Nerve Conduction Velocity
13. What is the relationship between size of the nerve and conduction velocity?
The larger the nerve the bigger the conduction velocity.

14. Keeping your answer to question 13 in mind, how might you draw an analogy between the nerves in the human body and electrical wires?
The nerves will be effected more by an increase in size of electrical wires but less with the increase in the size of the nerves.

15. How does myelination affect nerve conduction velocity? Explain, using your data from Chart 1.
It caused the conduction velocity to be higher. For the myelinated frog nerve the conduction velocity was 25.00 m/sec. The unmyelinated Rat nerve1 it was 16.48 m/sec. They were both the same size at medium.

16. If any of the nerves used were reversed in their placement on the stimulating and recording electrodes, would any differences be seen in conduction velocity? Explain.
Yes the reverse would be seen in the differences in how the size plays on the conduction velocity.

You May Also Find These Documents Helpful

  • Better Essays

    Physio Ex 9.0 Exercise 3

    • 2964 Words
    • 12 Pages

    Physiology Exercise 3 Activity 1 1. Explain why increasing extracellular K+ reduces the net diffusion of K+ out of the neuron through the K+ leak channels. Your answer: By increasing the extrecellular K+ the net diffiusion of K+ out the neuron through the eak channels is reduced. This is caused by the flow of ions following the concentration gradient of traveling from an area of high concentration to areas of low concentration. The higher concentration gradient would result in a reduced diffusions…

    • 2964 Words
    • 12 Pages
    Better Essays
  • Good Essays

    Exercise 3: Neurophysiology of Nerve Impulses Worksheet Eliciting a Nerve Impulse Activity 1: Electrical Stimulation 1. Do you see any kind of response on the oscilloscope screen? No there was no response, the line was flat 2. What was the threshold voltage, or the voltage at which you first saw an action potential? 3.0V 3. How does this tracing compare to the one that was generated at the threshold voltage? At 3.5V the high & low peaks were just slightly above and below respectively…

    • 1041 Words
    • 5 Pages
    Good Essays
  • Satisfactory Essays

    Physio Ex Exercise 4.1

    • 356 Words
    • 2 Pages

    Exercise 4: Endocrine System Physiology: Activity 1: Metabolism and Thyroid Hormone Lab Report Pre-lab Quiz Results You scored 100% by answering 6 out of 6 questions correctly. 1. Which of the following statements about metabolism is false? You correctly answered: d. All of the energy from metabolism is ultimately stored in the chemical bonds of ATP. 2. Thyroxine is You correctly answered: c. the most important hormone for maintaining the metabolic rate and body temperature. 3. Thyroid-stimulating…

    • 356 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Physio Ex Exercise 5

    • 532 Words
    • 3 Pages

    Review Sheet Exercise 5 Cardiovascular Dynamics NAME LAB DATE/TIME Vessel Resistance The following questions refer to Activity 1: Studying the Effect of Flow Tube Radius on Fluid Flow. 1. At which radius was the fluid flow rate the highest? 6.0 mm 2. What was the flow rate at this radius? 1017.4 mmHg 3. Describe the relationship between flow rate and radius size. It was direct 4. What happens to blood vessels in the body if increased blood flow is needed? They…

    • 532 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Exercise 2: Skeletal Muscle Physiology Worksheet Single Stimulus Activity 1: Identifying the Latent Period 1. How long is the latent period? 2.78 msec 2. Does the latent period change with different stimulus voltages?No Activity 2: Identifying the Threshold Voltage 1. What do you see in the Active Force display?I saw a very slight peak at .8 2. What is the threshold voltage? .8 V 3. How does the graph generated at the threshold voltage differ from the graphs generated…

    • 926 Words
    • 4 Pages
    Good Essays
  • Satisfactory Essays

    the physio ex

    • 503 Words
    • 4 Pages

    M01_ZAO2177_01_SE_CH01.QXD 3/4/11 1:36 AM Page 13 R E V I E W S H E E T EXERCISE NAME_________________________________ LAB TIME/DATE ________________________ A C T I V I T Y 1 1 Cell Transport Mechanisms and Permeability Simulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. ______________________________________________________ __________________________________________________________________________________________________…

    • 503 Words
    • 4 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Physioex 8.0 Exercise 3

    • 654 Words
    • 3 Pages

    Activity 1: Electrical Stimulation 1. Do you see any kind of response on the oscilloscope screen? NO 2. What was the threshold voltage, or the voltage at which you first saw an action potential? 3.0 V 3. How does this tracing compare to the one that was generated at the threshold voltage? The tracing travel in the same fashion but the tracing were different with an increase threshold voltage 4. What reason can you give for the change? Increase voltage 5. Record this maximal voltage here:…

    • 654 Words
    • 3 Pages
    Satisfactory Essays
  • Better Essays

    Physio Ex 9.0 Exercise 1

    • 960 Words
    • 4 Pages

    you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results compare with your prediction? a. I think the urea was not able to diffuse through the 20 MWCO membrane because the urea was too big to pass through. 3. Describe the results of the attempts to diffuse glucose and albumin through the 200 MWCO membrane. How well did the results compare with your prediction. a. Between the attempts to diffuse glucose and albumin through the 200 MWCO membrane, the results…

    • 960 Words
    • 4 Pages
    Better Essays
  • Good Essays

    Physio Ex 9.0 Exercsie 3

    • 2144 Words
    • 9 Pages

    PhysioEx 9.0 Exercise 3 Neurophysiology of Nerve Impulses A C T I V I T Y 1 The Resting Membrane Potential 1. Explain why increasing extracellular K_ reduces the net diffusion of K_ out of the neuron through the K_ leak channels. Increasing the extracellular potassium reduces the concentration gradient, and less potassium diffuses out of the neuron and into the cell. 2. Explain why increasing extracellular K_ causes the membrane potential to change to a less negative value.…

    • 2144 Words
    • 9 Pages
    Good Essays
  • Better Essays

    Physio Ex 8

    • 4569 Words
    • 19 Pages

    E 3 Neurophysiology of Nerve Impulses O B J E C T I V E S 1. To define the following terms: irritability, conductivity, resting membrane potential, polarized, sodium-potassium pump, threshold stimulus, depolarization, action potential, repolarization, hyperpolarization, absolute refractory period, relative refractory period, nerve impulse, compound nerve action potential, and conduction velocity. 2. To list at least four different stimuli capable of generating an action potential. 3. To list…

    • 4569 Words
    • 19 Pages
    Better Essays