Absorption into small intestine. Flashcards

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1
Q

What is the duty of the small intestine?

A
  • Products of digestion are absorbed into the blood stream into the small intestine.
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2
Q

What is the first adaptation of the small intestine to digest these molecules?

A
  • It is very long (Human SI is 5m).
  • ## Provides a large surface area for the absorption of the products formed during digestion.
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3
Q

What is the first adaptation of the villi inside of the small inestine?

A
  • Interior of small intestine is covered in Villi.
  • Increases the surface area for the absorption of molecules.
    + Microvilli on the surface increases further SA.
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4
Q

What is the second adaptation for villi?

A
  • Very good blood supply.
  • Bloodstream removes rapidly the products of digestion.
  • Increases concentration gradient.
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5
Q

What is the 3rd adaptation of the villi?

A
  • Thin membrane.
  • # Ensures a small diffussion pathway.
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6
Q

What do all of these features mean?

A
  • Means that there is a rapid rate of diffusion.

- Any molecules that cannot be absorbed by diffusion is absorbed by active transport.

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