B2.2 Tissues, organs and organ systems

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  • Created by: Stacy
  • Created on: 20-01-13 11:34

B2.2.1 Animal organs (part 1)

Large multicellular organisms develop systems for exchanging materials. During the development of a multicellular organism, cells differentiate so that they can perform different functions.

A tissue is a group of cells with similar structure and function. Examples of tissues include:

  • muscular tissue - contracts to bring about movement                                             
  • glandular tissue - produces substances such as enzymes and hormones                   
  • epithelial tissue - covers some parts of the body.

Organs are made of tissues. One organ may contain several tissues. The stomach is an organ that contains:

  • muscular tissue - churns the contents
  • glandular tissue - produces digestive juices
  • epithelial tissue- cover the outside and the inside of the stomach.
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B2.2.1 Animal organs (part 2)

 Organ systems are groups of organs that perform a particular function. The digestive system is one example of this. The digestive system includes:

  • glands - produces digestive juices (e.g. pancreas and salivary glands)
  • the stomach and small intestine - digestion occurs
  • the liver - produces bile
  • the small intestine - where the absorption of soluble food occurs
  • the large intestine - where water is absorbed from the undigested food, producing faeces.
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B2.2.2 Plant organs

Plant organs include stems, roots and leaves.

Examples of plant tissues include:

  • epidermal tissues - cover the plant
  • mesophyll - carries out photosynthesis
  • xylem and phloem - transport substances around the plant.
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