Review sheet 3 2 Define the abveMar ngovanwarypriod. 3 How did the threrhold the

Question

Review sheet 3 2 Define the abveMar ngovanwarypriod. 3 How did the threrhold the second action podential change as you further decreased the iaterve between the How well did the results compare with your prediction? 4, Why is it harder to generate a second action potential during the relative refractory period? s The Action Potential: Coding for Stimulus Intensity ACT l. Why are multiple action potentials generated in response to a long stimulus that is above threshold? 2. Why does the frequency of action potentials increase when he stimulus intensity increases? How well did the results compare with your prediction? 3. How does threshold change during the relative refractory period? 4. What isthe relationship between the interspike interval and the frequency of action potentials? ACTIVITY 7 The Action Potential: Conduction Velocity I. How did the conduction velocity in the B fiber compare with that in the Afiber? How well did the results compare with your prediction?

Explanation / Answer

2. Absolute refractory period is the peroid immediately after the firing of a nerve fibre when it cannot be stimulated regardless of the intensity of stimulus.
3. As the interval between the stimuli decreases, the threshold for second action potential increases.
4. As voltage gated potassium channels are open that oppose depolarisation, greater stimulus is required.

Activity 6
1. Because after relative refractory period longer stimuli recovery time above threshold allows action potential to occur.
2. When there is constant source of stimulation action potential occurs more frequently as long as the relative refractory period is reached.
3. Higher threshold is achieved as compared to the original stimulus intensity as compared to the refractory period.

4. The frequency of action potential is the reciprocal of interspike interval.

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