Human Anatomy Quiz 16: Electrical
Signals
depolarization, repolarization-✔✔ What phases do action potentials have?
all or nothing-✔✔ What kind of response is present until the threshold is
reached?
resting potential-✔✔ What is a membrane at before an action potential
begins?
leakage gates-✔✔ What is the only movement of ions through?
closed, -70mV-✔✔ Are the sodium and potassium gated channels opened
or closed at rest? What is the resting potential of the membrane at rest?
strength of the stimulus-✔✔ What does the number of channels opened
depend on?
the inside of the neuron becomes slightly positively charged, because of all
the sodium flowing in-✔✔ What happens to the inside of the neuron when
enough sodium channels are opened? Why?
many sodium channels are open, positive, positive feedback-✔✔ What
occurs in depolarization? What is the charge inside of the cell due to this?
What kind of feedback is involved here?
the more sodium gates that open-✔✔ The more positive the inside of a
cell becomes during depolarization…
potassium, sodium-✔✔ Which gates are opened during repolarization?
Which gates close?
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