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7169762
The Digestive System
Description
Mind map of the digestive system and associated concepts
No tags specified
biology
digestive system
science
chemistry
Mind Map by
Majestic Univers
, updated more than 1 year ago
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Created by
cian.buckley
almost 12 years ago
Copied by
Majestic Univers
almost 8 years ago
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Resource summary
The Digestive System
The Human Digestive System
Annotations:
[Image: http://www.jewishhealthzone.com/wp-content/uploads/2011/11/Diagram-of-the-Digestive-System.jpg]
Mouth
Where food is mixed and chewed with saliva
Enzyme called Amylase begins the breakdown of starch
Oesophagus
tube that carries food to the stomach by muscular action
Liver
produces bile which helps to breakdown fats
Small Intestine
food molecules are absorbed into bloodstream
after final breakdown by enzymes
Large Intestine
passes water back into the blood leaving solid waste
Stomach
stores food and mixes it with digestive juices
makes acid to kill bacteria
Pancreas
produces more digestive enzymes
Nutrition
Ingestion
taking food into the mouth
Digestion
breaking down of food into its molecules
physical/chemical
Absorption
passing of the food molecules through the walls of the small intestine and into the bloodstream
Assimilation
body cells take in the food molecules from the blood
cells use food molecules for energy, growth and repair
Egestion
undigested food is passed out of the body
e.g. Fibre
Digestion
Chemical
second stage of digestion
enzymes
made in mouth, stomach, pancreas and small intestine
catalysts
An Enzyme is a chemical, made in a living cell, which can speed up a chemical reaction, without itself being changed
substrate
substance enzyme acts on
product
broken down substrate
Phyical
first stage of digestion
breaking down of food into smaller pieces in the mouth
teeth
Annotations:
[Image: http://www.gtchild.co.uk/content/images/stories/human_body/teeth_mouth.jpg]
incisors
sharp teeth at front of mouth
used to cut food
canines
pointed teeth which tear food
premolars
flat teeth used to grind food
molars
large, flat teeth at the back
also used for grinding
An Enzyme in Action
Starch
carbohydrate made up of long chains of glucose molecules linked together
broken down in the mouth and small intestine by an enzyme called amylase
Amylase
breaks down starch into many molecules of a sugar called maltose
enzyme
Maltase
enzyme
acts on maltose molecules breaking them down into single glucose molecules
glucose molecules
final breakdown products of starch
small enough to be absorbed into blood
through wall of small intestine
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