Sinapsi H1-H2-H3 Flashcards

1
Q

H1

A

Gq

cuore
vasi
m.liscia non vasale
SNC

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2
Q

H2

A

Gs

cuore
m.liscia
vasi
mastociti
cell.parietali

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3
Q

H4

A

periferia

cell. ematopoietiche —> milza, midollo osseo, masts cells

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4
Q

H3

A

autorecettore pre-sinaptico

polmoni, intestino, SNC

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5
Q

reazioni

A

anafilattica - afilattoide

secrezione acida gastrica

SNC

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6
Q

L-istidina-decarbossilasi

A

L-istidina —> istamina

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7
Q

degradazione istamina

A

DAO

N-metil-trasferasi

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8
Q

DAO

A

diamino-ossidasi

degradazione istamina

istamina —> acido imidazolacetico

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9
Q

effetti istamina

A

shock anafilattico
prurito
edema
vasodilatazione vasi
vasocostrizione (H1) m. liscia —> broncospasmo
vasodilatazione (H2) m. liscia
cuore—> H1 —> dromotropo negativo
H2–> ionotropo, cronotropo, dromotropo positivo

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10
Q

anti-H1

A

agonisti inversi —> forma inattiva di H1

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11
Q

terapia H1

A

antikinetosi
allergie
prurito

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12
Q

effetti anti-H1

A

inibizione broncospasmo
inibizione vasocostrizione
inibizione prurito-edema

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13
Q

anti H2

A

inibizione secrezione acida gastrica

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14
Q

localizzazione istamina

A

cell.enterocromaffini
mastociti
basofili
SNC —> nucleo tuberomamillare

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