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Physiology > Membrane & Action Potential > Flashcards

Membrane & Action Potential Flashcards

1
Q

What is #1?

A

Depolarization phase

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2
Q

What is #2?

A

Repolarization phase

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3
Q

What is #3?

A

Undershoot

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4
Q

What is the green line?

A

Resting Potential

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5
Q

What is the yellow line?

A

Threshold

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6
Q

How are graded potential triggered?

A

Ligand, self-induced change in ion permeability

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7
Q

How are action potentials triggered?

A

Depolarization to threshold

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8
Q

How do ions move in graded potential?

A

Various means thru Na+, K+, Cl-, or Ca++

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9
Q

How to ions move in action potential?

A

Coordinated Na+ and K+ movement

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10
Q

What are the potential change in graded potential?

A

Depolarization or hyperpolarization

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11
Q

What are the potential changes in action potential?

A

Always starts w/ depolarization followed by hyperpolarization

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12
Q

What is the magnitude in graded potential?

A

Depends on strength of magnitude

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13
Q

What is the magnitude in action potential?

A

All-or-none magnitude

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14
Q

What is the duration in graded potential?

A

Varies

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15
Q

What is the duration in action potential?

A

Constant

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16
Q

Is there a refractory period in graded potential?

A

No

17
Q

What is the propagation in graded potential?

A

Decreases over distance

18
Q

What is the propagation in action potential?

A

Constant over time

19
Q

Why do plateaus occur in action potential?

A
  1. Opening of voltage-gated slow (Na and/or Ca) channels
  2. Slower opening of voltage-gated K channels
20
Q

What is C?

A

K+ channel

21
Q

What is E?

A

More K+ channel

22
Q

What is D?

A

More Na+ channel

23
Q

What is A?

A

Fast Na+ channel

24
Q

What does this graph show?

A

Ventricular muscle

25
Q

What is B?

A

Slow Ca++ channel

26
Q

What is A?

A

K+ channels close, slow Na+ channels opening

27
Q

What is C?

A

Ca++ channel close, K+ channel open

28
Q

What is F?

A

Slow depolarization (pacemaker potential)

29
Q

What is B?

A

Ca++ channels open

30
Q

What is D?

A

Ca++ permeability decreases

31
Q

What is E?

A

K+ permeability increases

32
Q

What graph does this show?

A

Pacemaker found in:

  • Heart
  • Most smooth muscles
  • Some neurons

Physiology (24 decks)

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