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National 5 Biology Course Notes Unit 2 : Multicellular Organisms Part 1 : Cells, tissues and organs.

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Presentation on theme: "National 5 Biology Course Notes Unit 2 : Multicellular Organisms Part 1 : Cells, tissues and organs."— Presentation transcript:

1 National 5 Biology Course Notes Unit 2 : Multicellular Organisms Part 1 : Cells, tissues and organs

2 Tissues Tissues are groups of cells that have the same structure and function. Each tissue consists of similar specialised cells. e.g. ciliated epithelium in the windpipe – specialised to sweep dust out of the windpipe Organs An organ is made up of different types of tissue e.g. the heart The heart is an organ that pumps blood around the body It is composed of several tissues, e.g. Muscle Nervous tissue Blood

3 A plant organ – the leaf A leaf is an organ whose function is photosynthesis. The diagram shows the layers of cells found inside the leaf Upper epidermis Palisade mesophyll Leaf tissues Spongy mesophyll Lower epidermis The leaf also contains two transport tissues xylem(transports water) and phloem (transports sugar) in the leaf veins

4 Summary of organisation of cells in multicellular organisms CELLS Are grouped together in TISSUES Groups of similar cells with the same function Several different tissues are found in an ORGAN Organs with similar functions are grouped into ORGAN SYSTEMS For example, the digestive system, the nervous system

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