FISIOLOGÍA GASTRO USMP
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Transcript of FISIOLOGÍA GASTRO USMP
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FISIOLOGIA
GASTROINTESTINAL JOSE ARMANDO TORRES
SOLISONCOLOGIA QUIRURGICA
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FISIOLOGIA GASTROINTESTINAL
1. GENERALIDADES, Principales !r"!nas #as$r!in$es$inales.Sis$e"a APUD.Re#%laci&n ner'i!sa (el apara$! (i#es$i'!
*. Mas$icaci&n, sali'aci&n, (e#l%ci&n. M!$ili(a( (e es&+a#! (eles$&"a#!.Secreci&n #-s$rica
. Secreci&n Pancre-$ica, c!"p!sici&n en/i"-$icaSecreci&n 0iliar. Secreci&n in$es$inal.In$es$in! Gr%es! +%nci!nes.
2. Fisi!l!#3a 4ep-$ica. Me$a0!lis"! ep-$ic!. Me$a0!lis"! (e la0ilirr%0ina. Circ%laci&n P!r$al
5. Di#es$i&n a0s!rci&n in$es$inal (e "acr! "icr!n%$rien$es.Di#es$i&n (e car0!i(ra$!s, #rasas pr!$e3nas, M!$ili(a( (elApara$! Di#es$i'!. De+ecaci!n.
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CI
LE
S
A
M
M
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FUNCIONES DEL APARATODIGESTI6O
NUTRICIONAL
INMUNOLOGICA
ENDOCRINA
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NUTRICIONAL
MOTILIDAD
A7SORCION
CIRCULACION
CONTROL
SECRECIONDIGESTION
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8QUI9N COMANDA LA
FISIOLOG:A;SISTEMA NER6IOSO AUT<NOMO
=4ORMONAS GASTROINTESTINALES
CONTROL
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• Sis$e"a ner'i!s! in$r3nsec!
• Sis$e"a ner'i!s! e>$r3nsec!
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INTRINSECO
• SISTEMA NER6IOSO ENTERICO
•
1?? MILLONES DE NEURONASMO6IMIENTO SECRECIONES
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CI
LE
S
A
M
M
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NEURONAS
1. SENSITI6AS*. MOTARA
S. INTERN
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SNE = SNC
A F E R E N
T E.. S E
N S I T I 6
A
E F E R E N T E
.. M O T O
RA
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• Se#@n el $ip! (e ne%r!na e+eren$e elc!n$r!l e>$r3nsec! (el apara$!(i#es$i'! p%e(e ser
1. SOMATICO*. AUTONOMICO
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SOMATICO
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AUTONOMICOPARASIMPATICO
1 1
1 *
AC
AC
*DANEURON
A SNE
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PARASIMPATICO
I, 6II
S*,S,S2
AUMENT APERISTALSIS
RELAJA ESFINTER
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AUTONOMICOSIMPATICO
1 1AC
*DANEURON
A SNE
1 1
GANGLIOS
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SIMPATICO
• DISMINU=EPERISTALSIS
• AUMENTE ESFINTER
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REFLEJOSGASTROINTESTINALES
1.REFLEJOS LOCALES*.REFLEJOS CORTOS.REFLEJOS LARGOS
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LOCAL
A F E R E N
T E.. S E
N S I T I
6A
E F E R E N T E
.. M O T O RA
E F E R E N
T E
.. M O T O R
A
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REFLEJOS LOCALES
• INTEGRADOS POR COMPLETODENTRO DEL SNE
• SECRECION , PERISTALTISMO,CONTRACCIONES DE MEBCLA,IN4I7ICION LOCAL
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LARGO
A F E R E N
T E.. S E
N S I T I
6A
E F E R E N T E
.. M O T O RA
E F E R E N
T E .. M O T O R
A
A F E R E N
T E.. S E N S I T
I 6A
E F E R E N
T E
.. M O T O R
A
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REFLEJOS LARGOS
• 6AGO6AGALES• REFLEJOS DE ESTOMAGO =
DUODENO• REFLEJOS DOLOROSOS• REFLEJO DE LA DEFECACION
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REFLEJOS CORTOS
• 6AN DEL INTESTINO A LOS GANGLIOSPRE6ERTE7RALES = REGRESAN
1. GASTROCOLICO*. ENTEROGASTRICO. COLICOILEAL
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CORTOS
A F E R E N
T E.. S E
N S I T
I 6A
E F E R E N T E
.. M O T O R
A
GANGLIOS
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TODOS
A F E R E N
T E.. S E
N S I T I
6A
E F E R E N T E
.. M O T O RA
E F E R E N
T E .. M O T O R
A
A F E R E N
T E.. S E N S I
T I 6A
E F E R E N
T E
.. M O T O R
A
GANGLIOS
A F E R E N T E.. S
E N S I T I
6A
E F E R E N
T E
.. M O T O R
A
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4ORMONASGASTROINTESTINALES
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APUDSNED
• A"ine Prec%rs!r Up$aeDescar0!>ilase
• FORMA PIRAMIDAL, GRNULOS EN LA7ASE
1. Sin$e$i/an p!lipHp$i(!s c!n car-c$er!r"!nal
*. Cap$an a"inas las (escar0!>ilan. S%s #r-n%l!s (e secreci&n se $ien
c!n sales (e la$a cr!"!
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4ORMONASGASTROINTESTINALES
SON POLIPEPTIDOS
SECRETADOS
CELULAS NER6IOSAS
CELULAS
GLANDULARES
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PARACRINA ENDOCRINA
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CELULA NER6IOSA
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FUNCIONESHormonas Gastrointestinales
MO6IMIENTO SECRECIONES
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Hormonas Gastrointestinales
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Regulación Endocrina y Paracrina del
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Regulación Endocrina y Paracrina delTGI
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• GASTRINA•
CC • SECRETINA• 6IP•
GIP
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Gastrina
• PHp$i(!s G2, G1, G12• Ori#en CHl%las APUD a"ine
prec%rs!r %p$ae (ecar0!>ila$i!n.Células G
• U0icaci&n An$r! #-s$ric!, in$es$in!(el#a(! pr!>i"al
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Gastrina: Funciones
• A%"en$ar la secreci&n (e -ci(! cl!r3(ric! pepsina
• A%"en$ar el creci"ien$! (e la "%c!sa (eles$&"a#! e in$es$in!
• A%"en$ar la "!$ili(a( #-s$rica (is"in%e la in$es$inal
• C!n$rae el car(ias • A%"en$ar secreci&n (e ins%lina l%e#! (e
in#es$i&n pr!$e3ca• A ni'el in$es$inal secreci&n (e a#%a
elec$r!li$!s
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Gastrina
Estímulo:• PHp$i(!s• A"in!-ci(!s•
Dis$ensi&n• PHp$i(! li0era(!r
(e Gas$rina
Inhibición:• Aci(e/ G-s$rica
Fee(0acNe#a$i'!
• Secre$ina• 6IP• PIG•
C!lecis$!ininaCC• S!"a$!s$a$ina• Calci$!nina
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• Gas$rin!"as. Pr!(%cen #as$rina %e!casi!na secreci&n (e -ci(! p!r eles$&"a#!
s3n(r!"e (e B!llin#er Ellis!n
• A%"en$ar la secreci&n (e -ci(! cl!r3(ric!
pepsina• A%"en$ar el creci"ien$! (e la "%c!sa (el
es$&"a#! e in$es$in!• A%"en$ar la "!$ili(a( #-s$rica (is"in%e la
in$es$inal• C!n$rae el car(ias • A%"en$ar secreci&n (e ins%lina l%e#! (e in#es$i&n
pr!$e3ca•
A ni'el in$es$inal secreci&n (e a#%a elec$r!li$!s
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Colecistokinina CC!"
• PHp$i(!s CC 5, , , 1*, • Ori#en in$es$in! (el#a(! pr!>i"al.• Cel%las I• 5 "in (e 'i(a "e(ia
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CC!: Funciones
• Contrae la vesícula biliar• Secreta jugo pancreático rico en enzimas • A%"en$ar la acci&n (e la secre$ina en la
pr!(%cci&n (e %#! pancre-$ic! alcalin!
0icar0!na$!• Inhibir el vaciamiento gástrico • E+ec$! $r&Kc! s!0re el p-ncreas• A%"en$ar la secreci&n (e en$er!inasa •
A%"en$ar la c!n$racci&n (el p3l!r! "!$ili(a(in$es$inal• A%"en$ar la secreci&n (e #l%ca#&n • 7l!%ear el recep$!r (e #as$rina
CC! E tí l
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CC!: Estímulo eInhibición• Estímulo: PHp$i(!s, a"in!-ci(!s
-ci(!s #ras!s a ni'el in$es$inal.• A "a!r (e#ra(aci&n "a!r es$3"%l!
Fee(0ac p!si$i'!.
• Inhibición: al a'an/ar l!s pr!(%c$!s(e (e#ra(aci&n.
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#ecretina
• PHp$i(! (e * a"in!-ci(!s• Ori#en Células S (el in$es$in! s%peri!rFunciones:• Aumentar la secreción de bicarbonato
pancreática• A%"en$ar la acci&n (e la CC (e a%"en$ar la
secreci&n (e en/i"as pancre-$icas• Disminuir la secreción ácida gástrica +ase
in$es$inal (e la secreci&n #-s$rica• A%"en$ar la c!n$racci&n (el p3l!r!, disminución
del vaciamiento gástrico. • Es$i"%la la secreci&n (e ins%lina
# i E í l
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#ecretina: Estímulo einhibición• Estímulo:
– Aci(e/ – Pr!(%c$!s Pr!$eic!s (i#eri(!s
• Inhibición: – Alcalini(a( (e la secreci&n pancre-$ica
P$ tid I hibid
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P$%tido Inhibidor&asoacti'o &IP"
• PHp$i(! (e * a"in!-ci(!s• Ori#en ner'i!s (el $rac$!
#as$r!in$es$inal san#re• Funciones:
– Es$i"%la la secreci&n (e elec$r!li$!s a#%a.
– Relaa el "@sc%l! lis! in$es$inal es+3n$eres.
– 6as!(ila$a(!r. – Inhibe la secreción gástrica –
!stimula la secreción de
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• 6IP!"as.Secre$an pHp$i(! in$es$inal 'as!ac$i'!6IP %e !casi!na el s3n(r!"e (e6ernerM!rris!n, el c%al se "aniKes$ap!r (iarrea ac%!sa, ip!p!$ase"ia e
ins%Kciencia renal.• Es$i"%la la secreci&n (e
elec$r!li$!s a#%a.• Relaa el "@sc%l! lis! in$es$inal
es+3n$eres. • 6as!(ila$a(!r.
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• S!"a$!s$a$in!"a.Secre$an s!"a$!s$a$ina ca%san(ia0e$es "elli$%s, es$ea$!rrea c!leli$iasis.
P$ tid I hibid G( t i
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P$%tido Inhibidor G(stricoPIG"• Ori#en células " (el in$es$in! (el#a(!.• Es$3"%l! #l%c!sa, l3pi(!s a"in!-ci(!s
en la l%/ in$es$inal• Función:
– Inhibe la secreción ácida gástrica
– Es$i"%la la li0eraci&n (e ins%lina p!ra%"en$! (e la #lice"ia
– PEPTIDO INSULOTROPICO DEPENDIENTE DEGLUCOSA
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)otilina
• PHp$i(! (e ** a"in!-ci(!s• Ori#en cHl%las (e la "%c!sa
(%!(enal, cHl%las en$er!cr!"aKnes.• Funciones:
• C!n$rae el "@sc%l! lis! in$es$inal. • #egula motilidad interdigestiva$
Complejos motores migratorios%C&&'
• 6acia"ien$! #-s$ric!.
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O$ras
• Ins%lin!"as.• Fe!cr!"!ci$!"as• Gl%ca#!n!"as.
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#ustancia P
• PHp$i(! (e 11 a"in!-ci(!s• Ori#en cHl%las en(!crinas GI
ne%r!nas• C!e>is$e c!n ser!$!nina• Funciones:
– A%"en$a la "!$ili(a( in$es$in! (el#a(!. – Incre"en$a la secreci&n pancre-$ica e
in$es$inal – Ini0e la secreci&n (e #as$rina
P$ tid *ib d d G t i
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P$%tido *iberador de GastrinaP*G o +ombesina"
• PHp$i(! (e * a"in!-ci(!s• Ori#en Ner'i! 'a#! %e iner'a a
las cHl%las pr!(%c$!ras (e #as$rina• Funciones:
– Aumenta la secreción de gastrinapor vía vagal.
– Dis"in%e la "!$ili(a( in$es$inal
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,eurotensina
• PHp$i(! (e 1 a"in!-ci(!s• Ori#en células ( (el ile!n• Función:
– Inhibe la secreción ácida gástrica
– Inhibe la motilidad GI a%"en$a elV%! san#%3ne! al ile!n
• La li0eraci&n a%"en$a p!r presencia(e -ci(!s #ras!s.