2.1 Enzymes and Digestion
- Created by: maddie
- Created on: 01-12-12 20:21
View mindmap
- 2.1 Enzymes and Digestion
- Digestive system - long muscular tube and glands - produce enzymes to break food molecules into smaller ones for digestion
- major parts of digestive system
- oesophagus - thick muscualr wall - carries food from mouth to stomach - adapted for transportion
- stomach - muscular sac with inner layer prdocuing enzymes. Stores and digests food, particulalry protein _> produces protease. Has mucus lining- prevent being digested by own enzymes
- Small itestine - long muscular tube. Digests food using enzymes produced in its walls and glands. Lining has villi and micro villi to increase surface area -> more molecules into bllod stream
- rectum - final section of intestines. faeces stored here before being excreted by anus during egestion
- large intestine- absrobs water, mosly from secretions of many digestive glands. Food becomes drier and thicker forming faeces
- slaivary glands - situated near mouth, passing secretions (containing amalyse to digest starch) via duct into mouth
- pancreas - gland below stomach, produce pancreaitc jucie conating protease, amalyse & lipase
- digestion takes place physically or chemically
- physically
- food broken to small pieces by structure i.e. teeth. Allows food to be ingested & icreases SA for chemical digestion
- food churned by stomach muscle to physically break it up
- chemically
- enzymes hydralse insoluble molecules to soluble ones
- enzymes are specific - usually 1 enzymes breaks large molecule into sections then hydrolysed into smaller molecules by another enzyme
- hydrolysis - splitting of molecules by adding H2O to chemical bonds
- once molecules hyrolysed absrobed from small intestine into bloo, then carried to body and built up again. Molecules incorprated into body and/0r used in bodily processes - assimilation
- enzymes hydralse insoluble molecules to soluble ones
- physically
Comments
No comments have yet been made