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How the small intestine is adapted for its job.
Descripción
The adaptations of the small intestine to insure quick and successful absorption and digestion.
Sin etiquetas
biology
cambridge igcse
biology
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glhoward13
, actualizado hace más de 1 año
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glhoward13
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Resumen del Recurso
How the small intestine is adapted for its job.
Very long with many folds.
This gives plenty of time for digestion to be completed and for nutrients to be absorbed.
About 5m long in an adult.
Has villi
Every villus has cells with even smaller projections called microvilli.
Gives inner surface of the small intestine a very large surface area
Food can be absorbed more quickly.
Contain blood capillaries (good blood supply).
Only one cell thick.
The digested food can easily cross the wall to reach the blood capillaries. Shorter diffusion path.
Concentration gradient maintained-helps diffusion.
Peristalsis constantly brings in a fresh supply of food, therefore high concentration gradient in the gut lumen.
Blood is flowing, constantly taking away the absorbed molecules therefore ensuring a low concentration here.
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