digestive system questions?

Question

1/what are two reasons why starch is not digested in the stomach?
2/the contents of the small intestine are liquid but the faeces are much more solid. explain what causes this to happen.
3/fill in the blanks:
Amylase speeds up the digestion of___________. The product of this digestion is _______. Protease speeds up the digestion of ________. The product of this digestion is __________.
Words you can use to fill in the blanks: amino acids; fat; protein; fatty acids; starch; sugar.

4/ why do molecules of starch, protein and fat need to be digested?

5/ what do we call substances like amylase and protease which speed up the chemical reactions?

6/ what was produced in an experiment to cause the fall of the pH, if the digestion of milk fat by an enzyme is produced?

7/ Why was the fall in pH faster when bile is present in the milk fat? (refer to question above)

i would really appreciate help on this - we had a replacement teacher who taught us nothing about that and we...

...we have to hand it in for tomorrow. I've looked in all of my bio books and can't find anything.
thank you so much for those who answer!!!!

i correct...who answer appropriately

Answer 1

1. starch is digested by your saliva which breaks it down into sugars.

2. most of the contents of the small intestine are liquid as broken down food is absorbed by the villi, but large food particles also go through on their way to the large intestine.

3.

Amylase speed up the digestion of STARCH. The product of this digestion is SUGAR
Protease speeds up the digestion of PROTEINS The product of this digestion is AMINO ACIDS

4. starch is basically bonded sugars. Your body requires one sugar, glucose, in order to perform glycolysis to produce energy in the form of a molecule called ATP or Adenosine TriPhospahe.

5. enzymes

6. lactase

7. bile helps to digest lipids (which are fats and fatty acids)

Now vote for me for best answer because I just did your homework for you.

Answer 2

1/ Carbohydrate digestion begins with saliva in the mouth, the stomach does not produce any enzymes that digest carbs, only pepsin which begins the breakdown of proteins.
2/ The chyme in the small intestine is liquidy, but the job of the large intestine is to hold the undigested matter, and absorb minerals and the excess water making the stool firm.
3/ Amylase speeds up digestion of maltose into two glucose molecules, Protease breaks down proteins. The final breakdown of proteins are amino acids.
4/ The body cannot use whole food products, so lipids, carbs, and proteins must be broken down to be asborbed in to the blood.
5/ Digestive enzymes
6/It must be an acid, but I cannot say which ones
7/ Bile speeds up the breakdown of lipids, so the reaction is faster.
I wish I could have been more help on the milk fat question, I am kinda stumped on that one.

Answer 3

The digestion of starch starts from mouth only because for this an enzyme called amylase is needed which digests starch to glucose hence if we chew a bite of chapati of bread for longer time we it gives a sweet taste bcoz of complete digestion of starch to sugars. The enzymes needs a particular pH i.e. 6.5 and stomach pH is very acidic.
In the intestine there is absorption of water along with the minerals and digested food nutrients, the remaining part contains less water content and more undigestible solids which are thrown out. Hence during diarrhoea the persons intestinal capacity of uptake of water decreases and there is loss of water in feaces.
starch, simple sugars, proteins, amino acids,
Because these are very complex and cannot be absorbed by body untill digested to simpler form. Body cannot obtain energy from complex forms.
Enzymes (Biological catalysts)
Fatty acids are produced
The digestion of regular fats and oils, which are usually long-chain triglycerides, requires bile acids as well as lipases. Hence is bile is present the digestion occurs at faster rate.

Answer 4

Go to google and type in part or all of the questions, or a few of those words. It takes a minute or two to read and find the answers. I actually read some of the answers on search results. Sorry, but sometimes the best way to REALLY help someone, is not to help at all. Good luck.

Answer 5

Don't be a lazy mooch and do your own homework!