Tissues organs and systems
- Created by: aryan26
- Created on: 08-04-19 12:03
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- Tissues, organs and systems
- A tissue is a group of cells that are specialised to work together to carry out a particular function
- Animal tissues
- Squamous epithelium- single layer of flat cells lining the surface
- Ciliates epithelium- found on surfaces where things need to be moved
- Muscle tissue- bundles of elongated cells called muscle fibres
- Smooth- in stomach wall
- Cardiac- in the heart
- Skeletal- use to move
- Cartilage- connective tissue in joints. Shapes and supports ears, nose and windpipe
- Formed when chondroblasts secrete an extracellular matrix which they become trapped inside
- Animal tissues
- Plant tissues
- Xylem: transports water and provides support. Contains hollow xylem vessel cells, which are dead and living parenchyma cells.
- Phloem: transports sugars. Arranged in tubes and is made up of sieve cells, companion cells and ordinary plant cells.
- Each sieve cell has end walls with holes in, so sap can move easily- these are called sieve plates
- Organs
- An organ is a group of different tissues that work together to perform a particular function
- Organs work together to form organ systems- each system has a particular function
- The respiratory system- made up of all the organs, tissues and cells involved in breathing
- The circulatory system is made up of all the organs involved in blood supply
- The lungs: contain squamous epithelial tissue, ciliates epithelial tissue, elastic tissue and vascular tissue
- Leaves: contain palisade cells as well as epidermal tissue an xylem and phloem tissues in the veins
- A tissue is a group of cells that are specialised to work together to carry out a particular function
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