digestive system Flashcards

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1
Q

what does the small intestine have?

A

selectively permeable membrane

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2
Q

what does it mean by selecitvely permeable membrane in the small intestine?

A

only small molecules can pass through to the blood and not large

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3
Q

what are large molecules?

A
  • starch
  • protein
  • fats
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4
Q

what are small molecules?

A
  • sugars (maltose)
  • amino acids
  • fatty acids and glycerol
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5
Q

what is starch broken into?

A

sugars (maltose)

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6
Q

what is protein broken into?

A

amino acids

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7
Q

what is fat broken into?

A

fatty acids and glycerol

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8
Q

what is the role of the small intestine?

A

absorbs nutrients into the blood via the large numbers of villi

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9
Q

what are features of the small intestine that increase efficiency of absorption?

A
  • large numbers of villi
  • thin wall
  • large surface area
  • extensive blood supply
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10
Q

what does the lacteal absorb?

A

fatty acid and glycerol

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11
Q

what does the blood capillary absorb?

A

glucose and amino acids

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