PhysioEx3NeurophysioogyHWKQUestions Wolf

979 WordsMar 13, 20154 Pages
Exercise 3 Neurophysiology of Nerve Impulses Activity 1 1. What happens to the resting membrane potential when extracellular K+ concentration is increased? -The resting membrane potential will become more positive when K+ concentration is increased. 2. Explain why the resting membrane potential had the same value in the cell body and in the axon. -The resting membrane potential has the same value in the cell body and the axon because the typical resting membrane potential is the same throughout the entire neuron. 3. Describe what would happen to the resting membrane potential if the sodium-potassium transport pump was blocked. -If the potassium transport pump was blocked the leakage channels would still be open allowing Na+ to…show more content…
-An absolute refractory period ensures directionality of action potential propagation because once the action potential comes through, that section is in in refractory period and has to wait to go again. This ensures that things keep moving forward because the action potential has nowhere else to go but forward. 5. Looking at your data. Under what conditions is a second action potential generated? -From my data, the conditions that a second action potential requires are a larger interval between stimuli and a smaller stimulus voltage. For example, there was a second action potential when the interval between stimuli was 250 and the stimulus voltage was 20. There wasn’t a second action potential when the interval between stimuli was 60 and the stimulus voltage was 20. 6. Why is it harder to generate a second action potential during the relative refractory period???? -It is harder to generate a second action potential during the relative refractory period because a greater stimulus is required because voltage-gated K+ channels that oppose depolarization are open during this time. Activity 7 1. Rank the conduction velocity in the axons A, B, C from fastest to slowest. -A: Type A fibers -B: Type C fibers -C: Type B fibers 2. Why did the time between the stimulation and the action potential at R1 differ for each axon? -The time between the simulation and the action potential at R1 differed for each axon because the axon diameter and amount

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