The digestive system
Biology- The digestive system
- Created by: Hebe Monks
- Created on: 21-09-14 15:17
View mindmap
- The Digestive System
- Poylmers hydrolysed into smaller, more souble molecules.
- Small Intestine:
- Ileum
- Souble molecules absorbed throught villi.
- Duodenum
- Bile& Pancreatic juice neutalise the acidity of chyme and break it down.
- Ileum
- Large Intestine:
- Absorbs water, minerals, salts
- Folded wall- large surface area.
- Bacteria that decompose undigestived nutrients, found here.
- Oesophagus:
- Mucle contractions- Peristales
- Food= Mouth-->Stomach.
- Mucus secreted.
- Stomach:
- Small sac. Lots of folds- Allows expansion.
- Entrance/exit- Spincter.
- Gastric Jucie- Produced by stomach walls. Consists of hyrdocholric acid, pepsin, mucus.
- The Salivary Gland:
- Saliva= Mucus, mineral salts. amylase
- Salivary amylase breaks down starch--> Maltose (disccharide)
- Pancreas:
- Pancreatic juice: Amaylse, Trypsin, Chymotrypin, lipase.
- Also contains sodium hydrocarbonate to neutralise hydrochloric acid.
- Amaylase- Starch--> Maltose
- Trypsin&Chymotrypsin- Protein--> Peptides
- Lipase- Lipids--> Fatty acids& Glycerol
- Pancreatic juice: Amaylse, Trypsin, Chymotrypin, lipase.
Comments
No comments have yet been made