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Action Potentials Essay

  • Submitted by: lisabrook
  • on August 9, 2015
  • Category: Miscellaneous
  • Length: 1,027 words

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Below is an essay on "Action Potentials" from Anti Essays, your source for research papers, essays, and term paper examples.

Task 5 - 3report_potentials.pdf

Predictions
Exceeding threshold depolarization at the trigger zone______the likelihood of generation of an action potential.
increases
Action potential amplitude
does not change with distance
Increasing frequency of stimulation to the trigger zone
does not change number of action potentials.
Materials and Methods
Experiment 1: Effect of Stimulus Strength on Action Potential Generation
Dependent Variable
membrane potential
Independent Variable
stimulus strength (voltage)
Controlled Variables
frequency of stimulation, type of neuron
Experiment 2: Effect of Frequency of Stimulation on Action Potential Generation
Dependent Variable
membrane potential
Independent Variable
frequency of stimulation
Controlled Variables
stimulus strength (voltage), type of neuron
1. Which part of the neuron was stimulated?
trigger zone
2. Where was membrane potential measured?
axon
3. What was used to measure membrane potential?
voltmeter, patch clamp equipment and electrodes
Results
Table 3: Membrane Potentials at Different Stimulation Voltages, by Location.
a. Values of maximal depolarization of membrane potential (mV) at different stimulation voltages, by location.
Location Stimulation Voltage
0 V (no stimulation ) 2 V 4 V 6 V 8 V
Axon hillock -68 -63.2 -55.7 29.9 30.6
Axon -67.6 -72.6 -63.9 29.8 -67.6
Laboratory Repor
b. Action Potential Generation.
Location Stimulation voltage
0 V (no
stimulation )
2 V 4 V 6 V 8 V
Action
potential
generated?
NO NO NO YES YES
Difference in
action
potential
amplitude
with
distance
-0.4 9.4 8.2 0.1 98.2

Graph 1. Maximal depolarization of membrane potential at axon hillock and axon after different
stimulation voltages.
Resting membrane potential = -70 mV.
1. What was the resting membrane potential (no stimulation) recorded in Table 3?
-68 at Axon Hillock and 67.6 at Axon
2. At which stimulation voltage(s) did you see decrimental conduction of graded potential...

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Action Potentials. Anti Essays. Retrieved December 17, 2018, from the World Wide Web: http://parimatch-stavka7.com/free-essays/Action-Potentials-759949.html


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