Page 140 - Knowledge Organiser Yr7 24-25

Knowledge Base: Science 7.12 Nutrition Year 7
5. Bacteria and Enzymes in Digestion
5.1
Where are most bacteria found in the digestive system?
In the large intestine
5.2
Name one role of bacteria in the digestive system
To produce vitamins
5.3
What is found in digestive juices?
Enzymes
5.4
What is the role of digestive enzymes?
To break down large molecules of nutrients into smaller molecules
5.5
Name the three different groups
of enzymes involved in digestion
- Carbohydrase - Protease
- Lipase
5.6
Which group of enzymes break down carbohydrates into sugar molecules?
Carbohydrase
5.7
Which enzyme breaks down proteins into amino acids?
Proteases
5.8
Which enzymes breaks down lipids into fatty acids and glycerol?
Lipases
4. Digestive System
4.1 What is the function of the digestive system?
To break down food
4.2
What happens to food molecules during digestion?
Large food molecules are broken down into small molecules and are absorbed into the bloodstream
4.3
How are the products of digestion transported around the body?
In the blood
4.4
What are the names of the five organs of the digestive system between the mouth and the anus?
Oesophagus, stomach, small intestine, large intestine and rectum
4.5
Label a diagram of the organs of the digestive system
4.6 What is the role of the mouth in the digestive system?
4.7 What is the role of the teeth in digestion?
4.8 What is the role of the oesophagus in digestion?
4.9 What is the role of the stomach in digestion?
4.10 What is the role of acid in the stomach?
4.11 What is the role of the small intestine?
4.12 What is the role of the large intestine?
To chew food and mix the food with saliva
To break the food into smaller chunks
To transport food from the mouth to the stomach To churn the food and mix it with digestive juices To kill any harmful bacteria in the food
To absorb small nutrient molecules
To absorb water
4.13
What is the role of the pancreas and liver in digestion?
To produce digestive juices which are added as the food passes from the stomach to the small intestine
4.14
Where are the faeces stored before leaving the body through the anus?
The rectum
4.15
How does food move through the digestive system?
Muscles in the wall of the gut squeeze food along the digestive system
5.9 Where is bile made?
In the liver
5.10
What is the role of bile in digestion?
To break down lipids into smaller droplets to make it easier for the lipase enzymes to work on the lipids
140