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Villi in the Small Intestine

Key Questions

  • Answer:

    To absorb nutrients and the complete breakdown of food.


    Villi in the small intestine absorbs nutrients and completes the breakdown of food. Factors of its structure that help it function include

    • Large surface area (provides more surface area for exchange to take place)
    • Thin wall (reduces the distance that materials need to move)
    • Moist (assists the transport of materials across the exchange surface)

    The process that the nutrients move into the villi is diffusion.
    enter image source here
    Source, TommyIX, 2013

    The picture above is a diagram of what is inside the villus. It explains what kind of nutrients is absorbed by the blood capillary which is glucose, amino acids (and can also be nucleotides) and by the lacteal which is fatty acids and glycerol.

  • Answer:

    They sense the presence of food, complete the digestion process and absorb the digested food. They contract to push the undigested food to the large intestine.