BG Biology, once again

[Cream Soda]

I need some halp

From mouth to anus, describe EACH region of the digestive tract of the rat and what happens to food as it passes through each. BE SURE to include descriptions of any organs that assist in the process of digestion.

[Chun Liroy]

The digestive systems of humans, dogs, mice, horses, kangaroos and great white sharks are, to a first approximation, virtually identical.

http://www.vivo.colostate.edu/hbooks.../overview.html

Perhaps just use a human's digestive track?

Oh region... not organ.. Uh don't you have a book?

[Penthesilea]

Upper GI
mouth cavity, pharynx, esophagus, stomach,and duodenum

Lower GI
Small - Duodenum, Jejunum, ileum
Large - Cecum, Colon, rectum

Anus

Just go through your notes and describe the different enzymes within saliva/stomach acid/absorption of H20 & Nutrients in the various section of the small and large intestines

[Cream Soda]

http://www.vivo.colostate.edu/hbooks.../overview.html

Perhaps just use a human's digestive track?

Oh region... not organ.. Uh don't you have a book?

No, I don't. My lecture teacher is different than my lab teacher. In lecture, we go purely off the class notes, so we don't need the book. That being said, not buying a $200 book for a lab section.

[SDSD]

No, I don't. My lecture teacher is different than my lab teacher. In lecture, we go purely off the class notes, so we don't need the book. That being said, not buying a $200 book for a lab section.

You don't need to buy the book. I'm guessing you're using Biology (Campbell and Reece 7th/8th edition) like every other AP level/introductory college bio class. You can find pdfs of both editions online very easily. As an above poster said, I would just go through the important enzymes, what they act on, and where they do it.

I TAed an introductory bio class last year that I might still have material for but I doubt it. I would recommend making a gigantic flow chart with sections marked off for important regions of the body and follow individual classes of molecules through the digestive system. Make sure you know where each thing is secreted and the hormonal control mechanism involved (stimulation, inhibition), especially those associated with gastrin, secretin, and CCK. From what I remember, human digestion (and most other mammals) go something like this, but there are some details missing that I can't look up right now.


Carbohydrates
Mouth, Pharynx, Esophagus: Salivary Amylase (know where it's secreted and in reaction to what) :: polysaccharides (starch, long-chain glucose >> smaller polysaccharides (maltose)
Small Intestine (Lumen, mostly in the duodenum region) : Pancreatic Amylase (same as above) :: Polysaccharides (ones that weren't cut by SA) >> Maltose and other disaccharides
Small Intestine (Epithelium) : Maltose + Disaccharides >> Monosacchrides (don't remember enzyme name)

Protein
Stomach : Pepsin (you should know the relationship to pepsinogen, mechanism of activation, regulation, place of secretion) :: Proteins >> Small chain polypeptides
Small Intestine (Lumen) : Trypsin, Chymotrypsin (As with pepsinogen/pepsin, know the important details for both) :: Large-chain polypeptides >> Small chain polypeptides
Small Intestine (Lumen) : Pancreatice Carboxypeptidase (same details as above) :: Small chain polypeptides >> Amino Acids
Small Intestine (Epithelium) : Dipeptidases, Carboxypeptidase, Aminopeptidase (each of these act on different molecules, know them, and the standard details) :: Small peptides >> AA

Nucleic Acids
Small Intestine (Lumen) : Pancreatic Nucleases (standard details) :: DNA/RNA >> Nucleotides
Small Intestine (Epithelium) : Nucleotidases (standard details) :: Nucleotides >> Nucleosides
Small Intestine (Epithelium) : Nucleosidases, then Phosphatases (standard details) :: Nucleotides >> Nitrogenous Bases, Deoxyribose/Ribose, Phosphates

Fat
Small Intestine (Lumen) : Bile Salts (standard details + the chemical mechanism (this is very important)) :: Large Fat Globules (aggregations of tri/di-glycerides) >> Fat Drops
Small Intestine (Lumen) : Pancreatic Lipase (standard details) :: Fat Drops >> Glycerol, monoglycerides, other fatty acids

[kuronosan]

Are you serious? Pick up a vertebrate anatomy book man. :\

[Nekonaruto]

You never go ass to mouth.

[Pirian]

You never go ass to mouth.

Smartest thing in this thread.

Seriously, go to your school library. They pretty much always have a copy of all the books used and for something simple like this you can look it up yourself.

[Eggroll]

Like other posters have said, check your library, pretty much every textbook used throughout the school should be on reserve. If your bookstore sells used books and has a buyback policy you can also get textbooks for cheap. Here, if you buy a used text book you get 25% off what it would cost new, and you can sell it back for 50%, so you only end up paying 25% of the full price. Also, a new trend amongst publishers has been selling access to websites which have the entire text book, and usually for a cheaper price as well, so that's worth looking into as well.