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digestive system

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digestive system

Postby bittersweet612 » Thu May 11, 2006 3:16 pm

how do physical and chemical processes of digestion work together in your mouth, your stomach, and your small intestines?

please help!!!!
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Postby nugget » Thu May 11, 2006 4:07 pm

hello
thats a big question but illl start you off.

Mouth : Physical : Chewing increasaes the surface area of the substrate that the digestive enzymes will work on.
Chemical: certain carbohydrate/starch digesting enzymes found in saliva begin the digestion of starch.

this is essentially the beginning of digestion
It should be easily located in a texrtbook, but you jsut have to think, ok so what physical process is occuring at this stage, i.e chewing in mouth or churning in stomach. Then consider, how will this assist the chemical processes(which you will also need to research) ?? Whats happening to ensure proper efficient digestion??
Think of these as you read textbooks ok??
hope that helps
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Postby swatkat » Fri May 12, 2006 6:48 pm

refer u rbooks or search on the net
u ll find loads of stuff on digestion
Gluck(following Nugget's example!!!)
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Re: digestive system

Postby Lobo Mau » Tue May 16, 2006 10:02 am

bittersweet612 wrote:how do physical and chemical processes of digestion work together in your mouth, your stomach, and your small intestines?

please help!!!!


Answer: Through Mechanical and chemical digestion, i.e. mechanical digestion in the mouth aids swallowing, mechanical and chemical digestion in the stomach aids furter breakdown of food, which is liquidised (chyme), and chemical digestion in the duodenum facilitates absortion of nutrients molecules into the bloodstream. :P
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Digestion in mouth

Postby ahlstrom61 » Thu Jul 20, 2006 6:10 am

Just a quick follow up question about the digestion process. As the digestion process is started in mouth for some starches, are any of those starches (e.g. simple sugars) actually absorbed in the mouth? Or are all macro nutrients absorbed through the GI tract?

As a related question, are any micro nutrients (e.g. bioflavonids) absorbed in the mouth?

Thanks,
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Postby Sang » Thu Jul 20, 2006 8:03 am

No. In the mouth, there are just two digestions: Physical (teeth) and Chemical (saliva). Enzyme here is Amilase (Ptyalin) which just works with Carbonhidrat. So, in stomach, there are enzyme called Pepsin (works with Protein) and HCl (works with Pepsinogen become Pepsin).
In intestines, there are more than 7 kind of emzymes work together: Trypsin (Polipeptid, Nucleoprotein), Lipase (lipid) , Pepsin (Protein, Nucleoprotein), Dipeptidase (dipeptid), Chymopeptidase (Peptid havaround structure C6H6) , Animopeptidase - Carbonxyldase (work with Polipeptid become Acid amin), ...
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