B3 Digestive system Flashcards
What is the function of the digestive system?
Large insoluble molecules are broken down into small soluble molecules which can be absorbed.
Name the two types of digestion that takes place
Mechanical digestion
Chemical digestion
Name the enzyme found in saliva
Salivary amylase
What is the function of saliva?
Catalyses the hydrolysis of starch
Moistens the food to make it easy to swollow
Where is amylase made in the body?
Salivary glands
Pancreas
Describe the reaction catalysed by amylase
Hydrolysis
Starch –> maltose
Glycogen –> maltose
Name three disaccharides
Lactose
Sucrose
Maltose
Describe the reaction catalysed by maltase
Hydrolysis
Maltose broken down into alpha glucose
Describe the reaction catalysed by lactase
Hydrolysis
Lactose broken down into glucose and galactose
Describe the reaction catalysed by sucrase
Hydrolysis
Sucrose broken down into glucose and fructose
Where are disaccharidases found?
Membrane bound on epithelium of small intestine
Name the structures labelled A-D
A = oesophagus
B = Liver
C = Large intestine
D = Small intestine
Name the structures labelled A-C
A = Gall bladder
B = Stomach
C = Pancreas
Name the parts of the digestive system wall labelled A-C
A = Serosa
B = Layer of muscle
C = Mucosa
Why does the stomach wall produce mucus?
Reduce self digestion
Name the type of cell that produces mucus
Goblet cell