you could write a whole essay on that. And someone apparently did

http://www.biology-online.org/9/16_dige … n_food.htm

Vitamins and minerals are absorbed under their present state. They do not suffer any transformations.
Lipids are broken down by salivar lipase(Yes, there is such an enzyme), go through the stomach withough being attacked by any enzyme and are then attacked by intestinal and pancreatic enzymes.
Cazein(the protein in milk) is broken down in the stomach first, the the digested is finalized in the small intestine.
Lactose is NOT attacked by salivar amylase. It is attacked by the enzyme lactase in the small intestine

that’s odd, our tutorial says that amylase breaks down carbs…

What does carbs mean?

Carbohydrates… usually it means sugars

Lol… Sorry i am not used to some of these words.
Now, about that lactose
As we know, enzymes have an incredible specificity, each enzyme only catalyses a single chemical reaction. Ptialine catalyses the reaction of decomposing starch into a lot of dissacharides. It is true that it breaks down carbs(as you modern people say 😀 😀 ) but only some carbs: starch

Casein is digested by a protease in gastic juice called rennin.Casein is broken down to paracasein.By the way rennin is not produced in adults.

Intestinal juice contains disaccharases.Lactose is broken down to glucose and galactose by lactase(disaccharase)

Rennin, or labferment, is present in the stomach of adults, only in a much smaller amount. And it doesn’t exactly break down casein, it just turns the caseinogen into an insoluble form called Calcium paracazeinat(don’t know if i translated it correctly)

My Biology teacher had mentioned in class that rennin is not produced in adults.She also added that this was the reason why doctors ask patients to discontinue drinking milk after a certain age ❓ .but ,she had said that in an offhand tone.Rennin was not our major topic of discussion and i think she didnt bother to explain about that in detail.thanx a lot for correcting me. 🙂

I’m sorry, your teacher was wrong. It’s that the enzyme is in such a small amount in the stomach of adults, it can not do much…

Nah, if renin isn’t produced in adults, then they’ll suffer from sudden change of blood pressure on urination because their RAAS don’t work…:lol:

This is what i was afraid of: Confusion between 2 enzymes, that, for some reason, have the same name.
The gastric enzyme renine, also named labferment, has the before mentioned effect on the digestion of milk.

The other enzyme is the one victor mentioned, that is produced by the kidney. This one turns angiotensinogene into angiotensine I, that is later turned into the active angiotensine II, that has multiple offects, among which we can mention: stimulates aldosterone synthesis, produces hipertension and vasoconstriction…

I think those enzymes need a more systematic naming and classification…

i was told that the protease is reNNin and the other one is reNin. 😕

I never pay attention on that 1 ;etter addition…but the point is, both of them are same if they’re pronounced..:lol:

Right on,no denying that. 😆

@surya
They are both proteases 🙂

oh no,could u tell me about reNin(not the one produced by gastic glands).thanx.

turns angiotensinogen into angiotensin I by proteolysis.