Graph is below In Experiment 1, discuss why the amplitude of the action potentia
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Graph is below
In Experiment 1, discuss why the amplitude of the action potential did not increase as stimulation voltage increased above threshold.
In Experiment 1, explain why the membrane potential between the axon hillock and axon either charged or did not change with subthreshold stimulus. Differences of 1.0 mV or less are not significant.
318/2015 Laboratory Report PowerPhys v3.0 Laboratory Report Activity: Action Potentials Name Instructor Date: 03.18.2015 Predictions Materials and Methods Experiment 1: Effect of Stimulus Strength on Action Potential Generation 1. Dependent Variable: membrane potential 2. Independent Variable: stimulus strength (voltage) 3. Controlled Variables: : frequency of stimulation, type of neuron Experiment 2: Effect of Frequency of Stimulation on Action Potential Generation 1. Dependent Variable: membrane potential 2. Independent Variable: frequency of stimulation 3. Controlled Variables stimulus strength (voltage), type of neuron 4. Which part of the neuron was stimulated? 5. Where was membrane potential measured? 6. What was used to measure membrane potential? Results Table 3: Change in Membrane Potential From Axon Hillock to Axon Values of Maximal Depolarization of Membrane Potential (mV) at Different Stimulation Voltages, by Location Stimulation Voltage ov (resting membrane potential) -68.4 67.3 2V -63.3 -72.3 6V 30.9 30.8 8V 30.1 67.3 Location Axon Hillock Axon Action Potential Generation Action potential generated? Difference in action potential amplitude with distance -55.8 -63.3 Yes Yes 7.5 0.1 97.4 Graph 1. Maximal Depolarization of Membrane Potential at Axon Hillock and Axon After Different Stimulation Voltages mV Axon hillock 40 Axon 20 -20 -40 -60 80 no stimulus 2V 4V 6V 8V 1/5 file://c:users/MelissaDocuments/Devry. 2015 BIOS%20252 /BIOS252%20Week%203%20Lab AP 5.htmlExplanation / Answer
Amplitude of the action potential did not increase as stimulation voltage increased above threshold?? Because of all or none law, which states that there is no in-between action potential. If a threshold stimulus of -50mV is reached, then action potential will be generated, elsewise not. Action potential is generated due to movement of sodium and potassium ions in and across the membrane. After reaching, threshold, further movement of ions across membrane stops, no matter how much higher stimulation voltage is given.
The membrane potential between the axon hillock and axon either charged or did not change with subthreshold stimulus?? Again due to all or none law, membrane potential change or did not change due to all or none law; If the subthreshold stimulus sums up to threshold it will change, elsewise not.
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