Digestive Juice Produced

Summary of the digestion process

Digestive
juice produced / Enzymes in
the juice / Substance
acted on / Substances
produced / Notes
Mouth / Saliva / Salivary amylase / Starch / Maltose / Slightly alkaline or neutral. Saliva helps lubricate food.
Stomach / Gastric juice / Pepsin
Renin / Proteins (e.g milk
protein) / Peptides / 0.5% hydrochloric acid conditions for pepsin and kills most bacteria. Absorption of alcohol and some water soluble vitamins.
Small intestine / Pancreatic juice
from the pancreas
Bile from liver
Intestinal Juice / Trypsin
Chymotrypsin
Amylase
Lipase
Peptidase
Lipase
Maltase
Sucrase
Lactase / Proteins
Starch
Fats
Fats
Peptides
Fats
Maltose
Sucrose
Lactose / Peptides and
Amino acids
Maltose
Fatty acid and
Glycerol
Amino acids
Fatty acids and
Glycerol
Glucose
Glucose and
Fructose
Glucose and
Galactose / Bile emulsifies fats and aids its digestion.
Intestinal juice is secreted by cells in the duodenum and ileum.
Most absorption of sugars, amino acids, fatty acids, vitamins and minerals occurs in the ileum.
Colon / None / Dietary fibre / Free fatty acids
Gases / Breakdown of dietary fibre by bacteria. Production of B12 and vitamin K by bacteria. Some absorption of water takes place in the colon.