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Flashcards in AP I Deck (9)
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1

So for a given length of axon the intracellular resistance is _______ than ECF resistance which has more _______

-much greater
-area

2

ion channels act like _______. Ions continue to _______ after positive charges have ceased flowing into the cell. The result of this is that l_______

-resistors
-leak out
-less current is delivered down the axon than was originally inserted.

3

Booster stations act by _______. Action potentials work in essentially the same way. The detector that senses the decaying message is the _______ and the energy source that propagates the message is the_______

-applying an energy boost to a decaying electrical signal when the incoming signal is detected
-voltage-gated sodium channel
-Na “battery”, i.e. the Na gradient that can inject extra positive charge into the cell

4

The _______ the membrane resistance becomes, the farther the voltage can spread down the axon, because it means _______

-larger
-there are fewer ion channels for charges to leak out of

5

Membrane capacitance is _______. These charges create _______

-the ability of charge to accumulate on two sides of a membrane
-an electrical force that that pulls oppositely charged ions toward it

6

Reducing membrane capacitance _______ the passive spread of voltage.

increases

7

When current is injected into the cell, it must follow either through the _______ or into the _______

- ion channels (as resistors)
-membrane capacitor

8

_______ internal resistance will slow the spread of voltage, as charge is _______ to the surrounding fluid.

-Increased
-lost

9

Resistance _______ as cross-sectional area decreases

increases