In Experiment 2, explain why the membrane potential between the axon hillock and
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Question
In Experiment 2, explain why the membrane potential between the axon hillock and axon either changed or did not change with threshold stimulus. Differences of 1.0 mV or less are not significant.
In Experiment 2, explain why the number of action potentials generated varied with increased stimulation freguency.
What was the resting membrane potential (no stimulation) recorded in Table 3? At which stimulation voltage(s) did you see detrimental conduction of graded potential from axon hillock to axon? At what stimulus voltage(s) did an action potential occur? What was the membrane potential at the axon hillock when the action potential was generated? for each of the stimulation voltages, indicate whether it was sub-threshold, threshold, or suprathreshold. 6. State the amount of time between stimulations for each frequency of stimulation.. 7. For each frequency of stimulation, indicate whether the period between stimulation is longer or shorter than the length of an action potential. Length of action potential in pyramidal neuron is about 15-20 milliseconds (msec).. In Experiment 2, explain why the membrane potential between the axon hillock and axon either changed or did not change with threshold stimulus. Differences of 1.0 mV or less are not significant. In Experiment 2, explain why the number of action potentials generated varied with increased stimulation freguency.Explanation / Answer
In Experiment 2, explain why the membrane potential between the axon hillock and axon either changed or did not change with threshold stimulus. Differences of 1.0 mV or less are not significant.
For voltage gated ion channels to open, the membrane potential needs to change from resting level by a minimum amount (threshold), which causes the channel to open for the passage of ions. In some cases, the resultant change in the distribution of charge will make the membrane depolarize (here membrane potential will be closer to 0 mV) and the trigger being reached either of a threshold and depolarize or not. The threshold stimulus will not have any effect on the membrane during the absolute refractory period as additional depolarizing stimuli will not lead to new action potential (here the Na+ channels are inactivated).
In Experiment 2, explain why the number of action potentials generated varied with increased stimulation frequency.
Nervous system will use the strength of the stimulus to change the frequency of action potential generated. When the stimulus is stronger, the higher the frequency at this action potential is generated and we can say nervous system is frequency modulated. During electrical stimuli, the sodium channel will open and sodium ions will enter inside and channels will be closed. So the polarization and depolarization depends on the stimulation frequency.