Download App
Google Android
Apple iOS
Huawei
English
English
Malay
Guest
Login
Register
Home
Quiz
Battle
Practice
Class
Classes List
Timetable
Assignments
Learn
Chapters Guide
Quick Notes
Videos
Experiments
Textbooks
Login
Register
Download App
Google Android
Apple iOS
Huawei
EN
MS
Learn
Quick Notes
List
Digestion
Digestion
9.2
Digestion
Physical digestion:
A process that involves mechanical action such as chewing action and peristalsis to break up large pieces of food into small pieces to increase the surface area for the action of digestive enzymes.
Chemical digestion:
The breaking down of complex molecules into simpler molecules to enable the molecules to be transported into body cells. The process involves a hydrolysis reaction catalyzed by digestive enzymes.
Process of digestion of carbohydrate in the mouth
The presence of food in the mouth triggers the salivary glands; parotid gland, sublingual gland, and submandibular gland to secrete salivary amylase that digests starch into maltose
Process of digestion of protein in the stomach
Mucous cell:
Produces mucus to protect the stomach wall from being eroded due to the action of hydrochloric acid.
Parietal cell:
Secretes hydrochloric acid to destroy bacteria and provides an acid medium for pepsin to function optimally.
Chief cell:
Secretes pepsinogen which is later converted into pepsin in the presence of hydrochloric acid to digest protein into the polypeptide.
Process of digestion of carbohydrate, protein, and lipid in the small intestine
Liver:
Produces bile which is stored in the gallbladder.
Gallbladder:
Secretes bile which is channeled to the duodenum by a bile duct.
Duodenum:
Pancreatic amylase hydrolyzes starch into maltose
Lipase hydrolyzes lipids into fatty acids and glycerol
Trypsin hydrolyzes polypeptides into shorter peptides
Pancreas:
Secretes pancreatic amylase, trypsin, and lipase which is channeled to the duodenum by a pancreatic duct.
Small intestine:
Maltase hydrolyzes maltose into glucose.
Lactase hydrolyzes lactose into glucose and galactose.
Sucrase hydrolyzes sucrose into glucose and fructose.
Erepsin hydrolyzes peptides into amino acids
Chapter : Nutrition and Digestive System of Humans
Topic : Digestion
Form 4
Biology
View all notes for Biology Form 4
Related notes
Digestive System
Absorption
Assimilation
Defaecation
Balanced Diet
Health Issues Related to the Digestive System and Eating Habits
Biological Field and Career
Safety and Rules in Biological Laboratory
Communication in Biology
Scientific Investigation in Biology
Report this note
Report Card
Evaluate your academic performance through detailed report
Learn more
Register for a free Pandai account now
Edit content
×
Loading...
Quiz
View video m
View note m
Account