Animal organs

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  • Animal organs
    • 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- which can contract to bring about movement
        • Glandular tissue- which can produce substances such as enzymes and hormones
          • Epithelial tissue- which 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- to churn  the contents
        • Glandular tissue- to produce digestive juices
          • Epithelial tissue- to cover the outside and the inside of the stomach
    • Organ systems are groups of organs that perform a particular function
    • The digestive system is one example of a system in which humans and other mammals exchange substances with the environment. The digestive system includes:
      • Glands- such as the pancreas and salivary glands, which produce digestive juices
        • The stomach and small intestine- where digestion occurs
          • The liver- which produces bile
            • The small intestine- where the absorption of soluble food occurs
              • The large intestine-  where water is absorbed from the undigested food, producing feaces


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