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Author Topic: Whats digestion?  (Read 3832 times)

UG

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Whats digestion?
« on: 08/02/2009 06:07:47 »
 [?] What is it? What happens? [?]


 

Offline Chemistry4me

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Whats digestion?
« Reply #1 on: 08/02/2009 06:09:23 »
Can you be a bit more specific?
 

UG

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Whats digestion?
« Reply #2 on: 08/02/2009 06:10:32 »
I would have thuoght that it is obvious.
Isn't it obvious????
 

Offline Chemistry4me

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Whats digestion?
« Reply #3 on: 08/02/2009 06:13:48 »
Well basically it is the breakdown of complex foods like starch and proteins into simpler ones like sugars and amino acids.
 

UG

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Whats digestion?
« Reply #4 on: 08/02/2009 06:15:29 »
Yeah, but what happens in the stomach?
 

Offline Chemistry4me

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Whats digestion?
« Reply #5 on: 08/02/2009 06:19:49 »
Gastric juice is secreted onto the food, and at the same time it is mixed by the action of muscle in the stomach wall. An enzyme in the gastic juice, pepsin, converts proteins into polypeptides. As a result, the food is slowly liquified. Gastric juice contains hydrochloric acid, which not only enables pepsin to work but also kills most bacteria. :)
 

UG

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Whats digestion?
« Reply #6 on: 08/02/2009 06:21:03 »
okay, thanks but what about the fats?
 

Offline Chemistry4me

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Whats digestion?
« Reply #7 on: 08/02/2009 06:22:10 »
You mean where are the fats digested?
 

UG

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Whats digestion?
« Reply #8 on: 08/02/2009 06:22:55 »
You mean where are the fats digested?
lol, yea, sorry.
 

Offline Chemistry4me

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Whats digestion?
« Reply #9 on: 08/02/2009 06:28:08 »
Food from the stomach is released into the first part of the small intestine (the duodenum). Two digestive juices - bile and pancreatic juices are secreted onto the food.

Bile is a yellow-green, alkaline liquid, secreted by the liver and temporarily stored in the gall bladder. It breaks up the large fat globules into an emulsion of millions of tiny droplets. This greatly increases the surface area of the fat, speeding up the action of fat digesting enzymes.
Pancreatic juice is secreted by the pancreas :) and contains enzymes that digest fat, proteins and starch. :)
 

UG

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Whats digestion?
« Reply #10 on: 08/02/2009 06:30:41 »
where does the food go after that?
 

Offline Chemistry4me

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Whats digestion?
« Reply #11 on: 08/02/2009 06:34:16 »
The glucose and amino acids produced have to pass through the lining of the small intestine, they are 'pumped' through by active transport. The area of the lining is greatly increased by vast numbers of finger-like villi. Each villus contains a network of microscopic blood vessles (capillaries), these eventually join to form the hepatic portal vein, which takes blood from the gut to the liver.
 

Offline Chemistry4me

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Whats digestion?
« Reply #12 on: 08/02/2009 06:35:44 »
In crossing the lining of the intestine, fatty acids and glycerol recombine to form tiny fat droplets. These enter the tiny lymph capillaries in each villus as an emulsion.
 

UG

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Whats digestion?
« Reply #13 on: 08/02/2009 06:37:47 »
wow :o thanks c4m, alot to remember :).
 

Offline Chemistry4me

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Whats digestion?
« Reply #14 on: 08/02/2009 06:40:26 »
The hepatic portal vein carries digested food to the liver. Some of the glucose is converted into glycogen and stored, the rest is used for energy in respiration. Some of the amino acids are used to make proteins, the rest are used for energy. :)
 

Offline Chemistry4me

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Whats digestion?
« Reply #15 on: 08/02/2009 06:40:50 »
wow :o thanks c4m, alot to remember :).
:):)
 

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Whats digestion?
« Reply #15 on: 08/02/2009 06:40:50 »

 

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