cell organisation

differentiation causes cells to become specialised, differentiation occurs during development of a multicellular organism
1. specialised cells form tissues which form organs which form organ systems
  1. large multicellular organisms have different systems inside them for exchanging and transporting materials
similar cells are organised into tissues
1. a tissue is a group of similar cells working together for a particular function, tissues can include more than one type of cell
  1. examples of tissues in mammals:
    1. Muscular tissue: contract to move whatever it's attached too Glandular tissue: produce substances (E.G enzymes & hormones) Epithelial tissue: covers some parts of the body(e.g inside of gut)
2. Tissues are organised into organs
  1. Organ is a group of different tissues working together for a certain function
    1. for example the stomachs an organ made up of:
      1. Muscular tissue to move stomach wall therefore churn up the food
        Glandular tissue which makes digestive juices to digest food
        Epithelial tissue which covers outside and inside of stomach
  2. Organs are organised into organ systems
    1. Large multicellular organisms are made up of organ systems
      1. organ system is a group of organs working together for a certain function
        for example the digestive system in mammals breaks down food and is made up of these organs...
        Glands (e.g pancreas and salivary glands) which make digestive juices
        stomach and small intestine which digest food
        liver which produces bile
        large intestine which absorbs water from undigested food, leaving foeces
        the digestive system exchanges materials with the environment by taking in nutrients and releasing substances such as bile
        small intestine which absorbs soluble food molecules
Plant cells also organised into organs and tissues
1. Plants are made of organs like stems, roots and leaves these organs are made of tissues
  1. leaves are made of ...
    1. Mesophyll tissue : where most photosynthesis in a plant occurs
      1. Xylem and Phloem: transport things like water, mineral ions and sucrose
        Epidermal tissue: covers the whole plant

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cell organisation

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	Erstellt von Jack Willepotte vor fast 9 Jahre