Human Phys 2.1 Flashcards

1
Q

Diffusion potential

A

Potential difference generated across a membrane when an ion diffuses down its concentration gradient

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2
Q

What is the only way diffusion potentials can be generated?

A

If the membrane is permeable to the ion

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3
Q

What does the magnitude of the diffusion potential depend on?

A

Size of concentration gradient

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4
Q

Equilibrium potential

A

Diffusion potential that exactly balances or opposes the tendency for diffusion down the concentration gradient

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5
Q

When did electrochemical equilibrium occur?

A

When the chemical and electrical driving forces acting on an ion are equal and opposite

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6
Q

When do membrane potentials arise?

A

When there is a difference in electrical charge between both sides of a membrane

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7
Q

What can charge differences result from?

A

Passive ion diffusion (open Na+ channel)

Electrogenic pumping (Na+K+ pump)

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8
Q

Why does K+ play an essential role in balancing Na+ in ICF?

A

Due to K+ leak channels (K+ can move while membrane is at rest)

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