Download - Sistema digestivo
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Organización estructural y
funcional que permite la
incorporación,
degradación y asimilación
de las sustancias nutritivas.
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Desde la boca hasta el ano, el tubo digestivo mide ≈ 11 m.
En la boca inicia la digestión, se da la trituración de alimentos (descomposición mecánica).
Los alimentos triturados se mezclan con la saliva (descomposición química.
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El bolo cruza la faringe, sigue por el
esófago y llega al estómago (secreta
el jugo gástrico).
En el estómago, el alimento es
agitado hasta convertirse en una
especie de papilla, denominada
quimo.
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Del estómago pasa al intestino delgado, y se transforma en el quilo.
El quilo luego es degradado y transformado en sustancias solubles que pasan a la sangre.
Pasa al intestino grueso (colon), y el material de desecho sale a través del ano.
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Tubo digestivo: boca, esófago,
estómago, intestino delgado, intestino
grueso.
Glándulas anexas: Hígado y
páncreas.
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