Biology Revision: Tissues,Organs and Organ Systems

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Organisation

Tissue- A group of cells with similar structure and function.

Organ- Made of tissues, may contain several tissues.

Organ system- Groups of organs that perform a certain function

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Animal Tissues,Organs and Systems

Animal Tissues include:

  • Muscular Tissue-Contracts to bring about movement
  • Glandular Tissue-Produces substances like enzymes and hormones
  • Epithelial Tissue-Covers some parts of the body

An Animal Organ example is the stomach, which contains:

  • Muscular Tissue-To allow contents to move through the digestive system
  • Glandular Tissue-To produce digestive juices
  • Epithelial Tissue-To cover the outside and the inside of the stomach.

An example of an Animal Organ System is the Digestive system, which includes:

  • Glands like the pancreas and salivary glands to produce digestive juices
  • The stomach and small intestine where digestion occurs
  • The liver, which produces bile
  • The small intestine, where soluble food is absorbed
  • The large intestine, where water is absorbed from undigested food, producing faeces.
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Plant Tissues, Organs and Systems

Examples of plant tissues include:

  • Epidermal Tissues, which cover the plant
  • Palisade Mesophylll, which carries out photosynthesis
  • Spongy Mesophyll, which has air spaces to facilitate diffusion of gases
  • The Xylem and Phloem, which transport substances around the plant

Fairly obviously, the plant organs include roots, the stem and the leaves

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