proteínas G Flashcards

1
Q

los esteroides son mensajeros que viajan libre en la sangre

A

falso, son no polares viajan unidos a proteínas

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2
Q

principal mensajero estimulante del SNC

A

Glutamato

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3
Q

precursor de los esteroides

A

colesterol

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4
Q

si se activa un receptor asociados a Gs aumentará el AMPc intracelular

A

cierto

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5
Q

para activar una proteína G se requiere

A

GTP

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6
Q

en el potencial de accion, la despolarización ocurre por…

A

entrada de NA

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7
Q

en el potencial de accion, la repolarizacion ocurre por:

A

la salida de K

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8
Q

responsable del aumento de la actividad de PKC

A

DAG

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9
Q

donde ocurre la inactivación de los canales de NA ocurre en…

A

el periodo refractario

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10
Q

en la despolarizacion que canal se abre

A

canal de NA

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11
Q

Esta compuesto por una única cadena polipeptídica que araviesa siete veces la membrana (siete dominio transmembrana).

A

RECEPTOR (acoplado a proteínas G)

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12
Q

PROTEÍNA G

A

Proteína fijadora de nucleótido de Guanina

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13
Q

Subunidades de la proteína G (3)

A

Alfa (α)= Es el sitio donde se une GDP y GTP
Beta β)
Gamma (γ)

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14
Q

SEGUNDOS MENSAJEROS (3)

A

AMPc (adenosín monofosfato cíclico)
-DAG (diacilglicerol)
-IP3 (inositol trifosfato)

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15
Q
A
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