AP I Flashcards Preview

M2M Unit III > AP I > Flashcards

Flashcards in AP I Deck (9)
Loading flashcards...

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

-much greater


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

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


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


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

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


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


Reducing membrane capacitance _______ the passive spread of voltage.



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

- ion channels (as resistors)
-membrane capacitor


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



Resistance _______ as cross-sectional area decreases