HUMAN SYSTEMS QUESTION 1986:               L. PETERSON/AP BIOLOGY
  
	Describe the processes of fat and protein digestion and product absorption 
	as they occur in the human stomach and small intestine.
	Include a discussion of the enzymatic reactions involved.

  
  STANDARDS:
  STOMACH:
  GENERAL POINTS
  1 - no absorption in the stomach
  1 - mechanical breakdown occurs in the stomach
  1 - protection of the stomach
  1 - chyme (definition)
  1 - chyme is in stomach for several hours (implied)
  1 - mention of the stomach being acidic due to HCl
  1 - parietal cells produce HCl / chief cells produce pepsinogen
  1 - gastrin (hormone)
  1 - hydrolysis (definition)
  PROTEIN POINTS
  1 - HCl - pepsinogen -> pepsin
  1 - pepsin--protein -> polypeptide
  FAT POINTS
  1 - very little digestion of fat in the stomach
  SMALL INTESTINE:
  GENERAL POINTS
  1 - pH becomes more basic
  1 - secretin (hormone)
  ABSORPTION
  1 - occurs in small intestine
  1 - microvilli
  1 - villi
  1 - increase surface area
  1 - amino acids -> capillary or amino acid absorption products
  1 - amino acids
  1 - fatty acids -> lacteals or lymphatic
  1 - glycerol -> capillaries
  1 - fatty acids by diffusion
  PROTEIN POINTS
  1 - trypsinogen/trypsin
  1 - chymotrypsinogen/chymotrypsin
  1 - peptidase/di/tripeptidase
  1 - endopeptidase (within molecule)
  1 - exopeptidase (terminal end of molecule)
  1 - protease
  1 - pancreas / intestinal gland
  1 - protein/polypeptide -> amino acid
  FAT POINTS
  1 - bile (liver - gall bladder)
  1 - cholecystokinin (hormone)
  1 - emulsify (definition)
  1 - lipase/pancreas
  1 - lipase function: lipids -> fatty acids and glycerol
  1 - Na bicarbonate