Compound which aids digestion and breaks down starch to maltose
Components & Functions of saliva
Compounds which digest food easily
Tongue pushes food to the back of the mouth
Teeth for mechanical digestion
Lubricates food for swallowing
Stomach digestion
1. Peristalsis (muscular contractions)
2. Churns food and stores it for about 4 hours
Components of stomach digestion
Pepsin (pre-digests proteins)
Hydrochloric acid (provides pH for pepsin)
Mucus (protects stomach lining)
Small intestine
First part of digestion, where food is absorbed into the blood and lymphatic system
Components of Duodenum
Bile (emulsifies fats)
Pancreatic juice (contains enzymes to break down fats, proteins and starch, and bicarbonate to neutralise acid)
Excessive secretion of gastric acid can cause ulcers
Bile is made by the liver, stored in the gall bladder and passed to the small intestine through the bile duct
Pancreatic juice aids the complete digestion of fats, proteins and starch, and increases the surface area for faster enzyme activity
Saliva contains amylase, which breaks down carbohydrates into simple sugars.
Mucus protects the stomach wall from being digested by its own acids.
Hydrochloric acid kills bacteria and provides optimum pH (2) for pepsin enzyme to work
Gastric juices contain hydrochloric acid, pepsinogen and mucus.
The digestive system is made up of the mouth, esophagus, stomach, small intestine (duodenum, jejunum, ileum), large intestine (cecum, colon, rectum), anus, liver, gallbladder, pancreas.
What are the functions of Hydrochloric Acid in the Stomach
To kill bacteria & Provide Optimum pH for the protease to work
What is the Bile-duct?
A tube that passes bile from the gall-bladder to Duodenum
