Neurophysiology of nerve impluses review sheet exercise 3

Note that the data collection box includes a Distance mm column and that this distance is always 43mm. Voltage leaves the stimulator via the red terminal, passes through the item to be stimulated in this case, the nerveand returns to the stimulator at the black terminal to complete the circuit.

V Click Record Data to record your results. Does this tracing differ from the original threshold stimulus tracing?

Lidocaine is a sodium-channel antagonist. The cell is in what is called the absolute refractory period. Testing the Effects of Curare Curare is a well-known plant extract that South American Indians used to paralyze their prey.

The membrane potential, picked up by the red wire, is then amplified by the bio-amplifier and the output is carried to the oscilloscope.

Click and drag the dropper from the bottle marked Lidocaine and position it over the nerve, between the stimulating and recording electrodes. When the electrons hit the phosphorescent material on the inside of the screen, a spot on the screen will glow.

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PHYSIOEX 0 EXERCISE 18B: NEUROPHYSIOLOGY OF NERVE IMPULSES

When the membrane depolarizes, the resting membrane potential of mv becomes less negative. It can be for any subject or class. Does this generate a trace? Curare had no effect - an action potential 12 Explain the reason for your answer to question 10 above.

A depolarization is any change in a neuron that makes it more positive than resting potential, but an action potential only occurs when the depolarization reaches the threshold level. V Click Record Data on the data collection box to record your results.

To summarize your experimental results, what kinds of stimuli can elicit an action potential? I know Anatomy is super hard. This is easily registered and viewable on an oscilloscope, without the aid of an amplifier.

The rat nerves are used so that you may 11 compare a the conduction velocity of different sized nerves, and b the conduction velocity of a myelinated versus unmyelinated nerve. When you electrically stimulate a nerve at a given voltage, the stimulus may result in the depolarization of most of the neurons, but not necessarily all of them.

Local anesthetics, alcohol and numerous other chemicals are also very effective in blocking nerve transmission. This repolarization occurs within a millisecond of the initial sodium influx and reestablishes the resting membrane potential.

What explains this effect? Remember, the red wire is the hot wire that carries the impulse from the stimulator and the black wire is the return to the stimulator that completes the circuit.

How does this trace compare to the trace that was generated with the unheated glass bar?

Continue to increase the voltage by 0. Remember the frog nerve is myelinated, and that rat nerve 1 is the same size as the frog nerve, but unmyelinated.

Thus, the time from the start of the trace on the left-hand side of the screen when the nerve was stimulated to the actual nerve deflection from the recording electrodes can be accurately measured.

Testing the Effects of Ether 1. If you saw no response, or a flat line indicating no action potential, click the Clear button on the oscilloscope, increase the voltage, and click Single Stimulus again until you see a trace deflection of the line that indicates an action potential.

On the stimulator, click on the Pulse button. Click Clear to clear the oscilloscope screen for the next activity.I am looking for answers to the Review Sheet portion of Exercise 3: Neurophysiology of Nerve oramanageability.com the lab book these questions start on page PEx and end on page Pex The first question: Q:Explain why increasing extracellular k+ reduces the net diffusion of k+ out of the neuron through the k+ leak channels.

View Neurophysiology of Nerve Impulses from PHGY at University of South Dakota. PhysioEx Exercise 3: Neurophysiology of Nerve Impulses Name: ALEXA DILLON Activity 1: The Resting Membrane.

REVIEW SHEET EXERCISE 3 Neurophysiology of Nerve Impulses Name Lab Time/Date. The Resting Membrane Potential REVIEW SHEET EXERCISE 3 Neurophysiology of Nerve Impulses Name Lab Time/Date ACTIVITY 1 The Resting Membrane Potential 1.

PHYSIOEX REVIEW SHEET EXERCISE 3 Neurophysiology of Nerve Impulses NAME_____ LAB TIME/DATE _____ ACTIVITY 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%(51). Review Sheet Exercise 3 Neurophysiology of Nerve Impulses NAME LAB DATE/TIME Eliciting (Generating) a Nerve Impulse 1. Why don’t the terms depolarization and action potential mean the same thing?

Because depolarization is the shift in electrical potential across a plasma membrane toward 0 to mV and action potential is a rapid voltage.

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Neurophysiology of nerve impluses review sheet exercise 3
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