Chapter 4- Digestion And Enzymes Flashcards
Name the four types of teeth
Incisors
Canines
Pre-molars
Molars
What is a substrate?
What an enzyme reacts on eg. Starch
Product
What is produced because of the enzymes reaction eg. Amylase’ product=maltose
What is an enzyme
(Like catalyst)
- A protein that speeds up a reaction w/o being used up in the reaction
- each enzyme has ONE function eg. Amylase acts on starch
Where does digestion begin?
The mouth
What are the two types of digestion?
- chemical
- physical
What is the next part of the digestive system after the mouth? What are it’s functions?
Oesophagus:
- muscular tube
- pushes food down (thanks to fibre)
What is the stomach’s function to digestion?
Stomach:
- muscular bag that holds food for a few hours
- Hydrochloric acid (HCL) softens food and kills bacteria
- enzymes also (chemically)digest food
- stomach churns food (physical)
What does HCL acid to in the stomach to aid digestion?
- softens food
- kills basteria
How does the mouth chemically and physically digest food?
Phys- Teeth chew food
Chem- Amylase acts on starch in saliva
How does the stomach physically and chemically digest food?
Phys- Churns food
Chem- Enzymes act on food
-HCL softens food and kill bacteria
How does the small intestine aid digestion?
- produces enzymes
- lower half passes digested food into blood stream
How does the liver aid digestion?
- creates the enzyme bile
- bike digests fat in the small intestine
Name two enzymes and what they act on
Amylase->starch
Bile -> fat
How does the panaceas aid digestion?
Creates enzymes to digest food in the small intestine
How does the large intestine aid digestion?
Takes water from digested flood and puts it into bloodstream
Excretes faeces
What are the digestive functions of the mouth?
- Physical digestion- Teeth
- Chemical Digestion-Salivary glands under tongue and in cheeks real ease the enzyme amylase which digests starch into maltose
Test for amylase
- Fill two test tubes with water and starch at 37*
- add amylase to one
- leave for ten minutes
- test both tubes for amylase using iodine
•The second test tube should remain orange because the amylase has acted on all of the starch
