Cell Organisation - Chapter 12 AQA AS Biology
chapter 12 - AS AQA biology
- Created by: H.N
- Created on: 08-12-12 14:42
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- Cell organisation
- all cells contain genes needed to develop into many cells but only a few are expressed in any 1 cell
- Organ systems
- organs - work together as a single unit
- may be grouped together to perform particular functions effectively
- examples in humans
- The digestive system
- the respiratory system
- brings 02 into the body + removes C02
- the circulatory system
- allows transport of gases + other substances around the body
- differentiation
- Tissues
- Examples
- Epithelial tissues - line the surface of organs +have a protective of secretory function (in animals)
- xylem- transport H20 + mineral ions through plant and gives mechanical support (in plants)
- organs - combination of tissues that are coordinated to perform a variety of functions
- but usually have 1 predominant function
- organ in animals = the stomach
- muscle - churn + mix stomach contents
- epithelium - protect stomach wall + produce secretion
- connective tissue - holds together other tissue
- organ in plants = the leaf
- palisade mesophyll - contain leaf pallisade cells that carry out phototsynthesis
- spongy mesophyll - adapted for gaseous diffusion (holes)
- epidermis - protect leaf + allow gaseous diffusion (upper epidermis - waxy cuticle to reduce H20 loss)
- phloem - transport organic materials away from leaf
- xylem - transport H20 + ions into the leaf
- Examples
- Tissues
- Examples
- Epithelial tissues - line the surface of organs +have a protective of secretory function (in animals)
- xylem- transport H20 + mineral ions through plant and gives mechanical support (in plants)
- organs - combination of tissues that are coordinated to perform a variety of functions
- but usually have 1 predominant function
- organ in animals = the stomach
- muscle - churn + mix stomach contents
- epithelium - protect stomach wall + produce secretion
- connective tissue - holds together other tissue
- organ in plants = the leaf
- palisade mesophyll - contain leaf pallisade cells that carry out phototsynthesis
- spongy mesophyll - adapted for gaseous diffusion (holes)
- epidermis - protect leaf + allow gaseous diffusion (upper epidermis - waxy cuticle to reduce H20 loss)
- phloem - transport organic materials away from leaf
- xylem - transport H20 + ions into the leaf
- Examples
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