Biology - Tissues, Organs and Organ Systems

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  • Created by: Sarah
  • Created on: 18-01-13 16:22

Intoduction

  • Large Multicellular Organsims are made up of Organ Systems
  • Similar Cells are Organised into Tissues
  • Tissues are Organsied into Organs
  • Organs are Organised into Organ Systems
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Large Multicellular Organisms are made up of Organ

Large Multicellular Organisms are made up of Organ Systems

  • Specialised cells carry out a particular function
  • The process oby which cells become specialised for a particular job is DIFFERENTIATION
  • Differentiation occurs during the development of an organism
  • These specialised cells form tissues, which form organs, which form organ systems
  • Large organisms have different systems inside them for transporting and exchanging materials
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Similar Cells are Organised into Tissues

Similar Cells are Organised into Tissues

A tissue is a group of similar cells that work together to carry out a function. It can include more than 1 type of cell. In mammals examples of tissues are...

  • Muscular Tissue - Contracts(Shortens) to move whatever it's attached to
  • Glandular Tissue - Makes and Secretes chemicals like hormones and enzymes
  • Epithelial Tissue - Covers some parts of the body like the inside of the gut
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Tissues are Organised into Organs

Tissues are Organised into Organs

An organ is a group of different tissues that work together to preform a function. Example the stomach is an organ made of the following tissues...

  • Muscular Tissue - Moves stomach wall to churn food
  • Glandular Tissue - makes digestive juices to digest food
  • Epithelial Tissue - covers the outside and inside of stomach
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Organs are Organised into Organ Systems

Organs are Organised into Organ Systems

An organ system is a group of organs working together to carry out a function. Example the digestive system breaks down food and is made up of the organs...

  • Stomach and small intestine -  digest the food
  • Liver - produces bile
  • Pancreas and salivary gland - produce digestive juices
  • Small Intestine - absorbs soluble foods
  • Large Intestine - absorbs water form undigested food leaving faeces

The digestive system exchanges materials with the environment by taking in nutrients and releasing substances such as bile.

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