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April 13
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Self-Study Exercises
(If you desire to keep a record of your efforts, please show a couple of logical steps
leading to the answers.)
Neural Pulses
1. Apply the simplified neural pulse model to plot a neural pulse assuming:
(a) α ¼ 110, β ¼ 86.66; Determine pulse width at 55 mV
(b) α ¼ 110, β ¼ 1; Determine pulse width at 55 mV
(c)
55 mV
(d) Derive a formula for time for a pulse to decrease from +40 to
α ¼
110,
β ¼
0.01; Determine pulse width at
55 mV in
terms of
β
. (ANS. t
Δ
¼
1 + 95/
β
)
2. Using 15 ms/cm
(a) How long is a line for a delay of 90 ms? (ANS. 6 cm)
(b) How long is a line for a delay of 600
μ
s? (ANS. 400
μ
m)
3. Assume a burst of neural pulses caused by an excitatory neurotransmitter to a
certain synapse.
(a) Describe briefly what causes the burst to end. (ANS. Presynaptic region goes
negative, tending to attract back home the positive neurotransmitter ions;
they are also encouraged to leave by back propagating positive pulses.)
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