AP I Flashcards

1
Q

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

A
  • much greater

- area

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2
Q

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

A
  • resistors
  • leak out
  • less current is delivered down the axon than was originally inserted.
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3
Q

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_______

A
  • 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
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4
Q

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

A
  • larger

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

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5
Q

Membrane capacitance is _______. These charges create _______

A
  • the ability of charge to accumulate on two sides of a membrane
  • an electrical force that that pulls oppositely charged ions toward it
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6
Q

Reducing membrane capacitance _______ the passive spread of voltage.

A

increases

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7
Q

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

A
  • ion channels (as resistors)

- membrane capacitor

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8
Q

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

A
  • Increased

- lost

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9
Q

Resistance _______ as cross-sectional area decreases

A

increases

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