biology unit 2- cells tissues and organs

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Tissues and Organs

  • Cells differentiate during the develpoment of multcellular organisms.
  • Cells have different functions
  • Tissues are groups of cells with similar structure & function.
  • Muscle tissue, contract for movement (A)
  • Glandular tissue, produces substances such as ezymes & hormones (A)
  • Epithelial tissue, covers some parts of the body (A)
  • Epidermal tissue, covers the plant (P)
  • Mesophyll, can photosynthesise (P)
  • Xylem & Phloem, transport substances around the plant (P)
  • Organs are made of tissues
  • Muscular tissue, churns stomach content
  • Glandular tissue, produces digestive juices in the stomach
  • Epithelial tissue, covers outisde and inside of stomach
  • Leaf,stem & root are organs that contain previous plant tissues.
  • Groups of organs form organ systems to perform particular functions
  • Digestive system has a few organs e.g. small intestine.
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Organ Systems

  • Food must be changed from insoluble molecules into soluble molecules.
  • Only soluble molecules can be absorbed into the blood
  • Digestive system does this
  • Digestive system is a muscualr tube. It includes:
  • Glands, e.g. the pancreas
  • Salivary glands produce digestive juices.
  • Digestion occurs in stomach and small intestine.
  • Liver produces bile.
  • Absorption of food occurs in small intestine
  • Water is absorbed from undigested food, producing faeces, in the large intestine.
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