Potencial de membrana yacción Flashcards

1
Q

potencial de difusion

A

dif de potencial en el interior y el exterior

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2
Q

Na

A

los iones entran a favor de su gradiente de [], generan una electropositividad al interior y negativo afuera

61mV

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3
Q

k

A

iones salen a favor de su gradiente
- interior
+ exterior

-94mV

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4
Q

Ec de nernst

A

para 1 ion

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5
Q

Ec goldman

A

varios iones diferentes

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6
Q

el potencial de difusion depende de 3 factores:

A
  1. polaridad de la carga electrica de c/ion
  2. permeabilidad de la membrana
  3. [] de los iones respectivos
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7
Q

potencial de reposo neurona

A

-60 a -70

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8
Q

potencial en reposo del esqueletico

A

-85 -95

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9
Q

potencial en reposo del liso

A

-50 a -60

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10
Q

potencial en reposo del <3

A

-80 A -90

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11
Q

potencial en reposo del coclea

A

-15 a -40

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12
Q

potencial en reposo del astrocito

A

-80 a -90

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13
Q

potencial en reposo del eritrocito

A

-8 a -12

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14
Q

potencial en reposo del fotoreceptor

A

-40 oscuro
-70 luz

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15
Q

fase de reposo

A

membrana polarizada, potencial negativo de -70

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16
Q

fase de despolarizacion

A

entrada de iones Na +

17
Q

fase de repolarizacion

A

se restablece el potencial de membrana

18
Q

Disminución de 50% de Ca

A

tetania muscular

19
Q

umbral de estimulacion

A

-55mV

20
Q

hiperpolarización

A

no existira autoexcitación

21
Q

periodo refractario absoluto

A

no se puede generar un 2do potencial de accion

22
Q

periodo refractario relativo

A

puede generar otro potencial, pero ocupa un estimulo mas fuerte