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Sumario Presentación del sistema digestivo
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Presentación del sistema digestivo
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LA FUNCIÓN DE NUTRICIÓN:APARATO DIGESTIVO
1. APARATOS QUE INTERVIENEN EN LA NUTRICIÓN
2. APARATO DIGESTIVO: FUNCIÓN Y COMPONENTES
3. FASES DE LA DIGESTIÓN
4. BOCA
5. FARINGE
6. ESÓFAGO
7. ESTÓMAGO
8. INTESTINO DELGADO
9. INTESTINO GRUESO
,2. APARATO DIGESTIVO. Está formado por:
TUBO DIGESTIVO y GLÁNDULAS ANEJAS (comunicadas con el tubo digestivo)
Boca Glándulas salivales
• Lengua • Parótidas
• • Submaxilares
Dientes • Sublinguales
Tubo Faringe
•
digestivo Epigloti
s Glándulas
Esófago anejas
digestivas
Estómago
• Cardias
(entrada) Hígado
• Píloro (salida) • Bilis
• Jugo gástrico • Vesícula biliar
Intestino delgado Páncreas
• Vellosidades intestinales • Jugo pancreático
• Tres regiones: duodeno,
yeyuno e ileon
Intestino grueso
• Ano y apéndice FUNCIÓN:
vermiforme
Descomponer los
• Tres regiones: ciego,
colon y recto alimentos para obtener
de ellos los nutrientes.
, 3. FASES DE LA DIGESTIÓN
1ªIngestión: entrada de alimentos en el tubo digestivo.
Esófago
10 a 15 segundos
2ªDigestión: transformación de los alimentos 25 centímetros
en nutrientes, de 2 formas:
• Acción mecánica Estómago
2 a 8 horas
• Acción química
(capacidad) 2,5 litros
Intestino delgado
7 a 8 horas
3ªAbsorción: paso de los nutrientes al 7 a 8 metros
torrente sanguíneo.
4ªEgestión: eliminación de las sustancias no digeridas. Intestino grueso
15 horas
1,5 metros
Tiempo de permanencia del alimento
y longitud de cada tramo
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