B3

Created by

Gracie Horton

Cards (22)

what is the function of digestive system?
To break down food and absorb nutrients.
the digestive system is also known as a organ system
the products of digestion are used to make new molecules such as glucose that we can use for respiration
what is mechanical digestion?
Physical breakdown of food into smaller pieces.
what is an enzyme?
A protein that catalyzes chemical reactions in living organisms.
how do enzymes work?
they work by having an active site with a specific shape. A specific molecule (substrate) will slide into the active site where the chemical reaction takes place
what is the lock and key theory?
The lock and key theory is a model that explains how enzymes interact with substrates. It suggests that enzymes have a specific shape (the lock) that only fits with a specific substrate (the key), allowing for a chemical reaction to occur.
what is bile?
a vital substance for digestion
where is bile made?
in the liver
where is bile stored?
in the gall bladder
where is bile transported to?
Small intestine
Bile is alkaline so it can neutralise the stomach acid to a pH of 8 (this is the optimum level for the small intestine for enzymes)
Bile emulsifies fat, what does this mean?
Breaks down fat into smaller droplets. They then have a larger surfaced area allowing rate of digestion to be faster
what is a carbohydrase?
an enzyme that breaks complex sugars into simple sugars
where are carbohydrase produced?
Carbohydrases are produced in the pancreas and small intestine.
what is the site of action for carbohydrase?
Small intestine
what is a protease? 
An enzyme that breaks down proteins into amino acids
Where is protease produced?
Protease is produced in the pancreas.
what is the site of action for protease?
stomach, small intestine
what is lipase?
enzyme that breaks lipids down into glycerol and fatty acids
where is lipase produced?
Pancreas and small intestine.
what is the site of action for lipase?
Small intestine