Establishing Membrane Potential Flashcards

1
Q

What is potential energy?

A

The ability to do work → gradient (difference between two points)

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2
Q

Gradient-driven flux requires?

A
  1. Gradient (concentration)

2. Carrier or pathway

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3
Q

Fick’s Law is used to find?

A

Net diffusional flux

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4
Q

Fick’s Law equation

A

Flux = DA(concentration difference / thickness of diffusion barrier)

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5
Q

Net diffusional flux depends on?

A
  1. Concentration gradient
  2. Area
  3. Coeffecient
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6
Q

Net diffusional flux coefficient accounts for?

A
  1. Molecular radius
  2. Solution viscosity
  3. Gas constant
  4. Temperature
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7
Q

Ohm’s Law is used to find?

A

Current (electrical flux)

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8
Q

Current is quantitative measure of?

A

Electrical flux

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9
Q

I represents?

A

Current

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10
Q

Ohm’s Law (2 forms)

A

Current = voltage / resistance

Current = voltage * conductance

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11
Q

Voltage is quantitative measure of?

A

Gradient

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12
Q

Conductance and resistance are quantitative measures of?

A

Pathway permeability

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13
Q

Unit of currents

A

Amps

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14
Q

Amps = ?

A

Coulombs / unit of time

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15
Q

Unit of voltage (gradient)

A

Volts

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16
Q

Unit of conductance

A

Siemens

17
Q

“Driving force” refers to?

A

Voltage

18
Q

g represents?

A

Conductance

19
Q

g of pure water

A

Low

20
Q

Adding salt to water has what effect on g?

A

Increases g

21
Q

Adding a barrier to a solution has what effect on g?

A

g = 0

22
Q

Making a barrier permeable has what efect on g?

A

Increases g

23
Q

Minimum requirements to establish resting membrane potential

A
  1. Power source
  2. Charge carrier
  3. Conductive pathway
  4. Gradient
24
Q

Nernst equation includes?

A

Concentration and electrical gradients (joins Fick’s and Ohm’s Laws)

25
Q

Nernst equation can be used to describe?

A
  1. Systems at equilibrium
  2. Direction of flux in current conditions
  3. Membrane potential if membrane is only permeant to one ion
26
Q

Concentrational gradient is proportional to?

A

Voltage (electrical gradient)