Cells, tissues & organs

new specification aqa biology unit 2 additional cells tissues and organs

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  • Created by: Chloe
  • Created on: 13-01-13 13:34
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  • Cells, tissues & organs
    • Tissues
      • Multicellular organisms differentiate
        • Different cells have different functions
      • Group of cells with similar structure & function
      • Plants & animals have different tissues
      • Plant tissues
        • Epidermal tissue - covers the plant
        • Mesophyll - can photosynthesise
        • Xylem & Phloem - transport substances
      • Animal tissues
        • Muscle tissue - can contract
        • Epithelial tissue - covers parts of body
        • Glandular tissue - produces enzymes and hormones
    • Organs
      • Made of tissues
      • Stomach is made of -
        • Muscular tissue - churns food contents
        • Glandular tissue - produces the  Digestive juices
        • Epithelial tissue - covers inside and outside
      • Leaves, Stem and Roots and plant organs
      • Organ Systems are formed by groups of organs
      • The Digestive system ia a human organ system
      • Digestive system
        • Insoluble food molecules change in the  digestive system
        • Soluble food molecules are absorbed into blood
        • Is a muscular tube which  digests food
        • Pancreas & Salivary glands -digestive juices
        • Small intestine & stomach - digestion occurs
        • Liver - produces bile
        • Small intestine - absorbs soluble foods
        • Large intestine - absorbs water & produces faeces
    • Specialised cells
      • Structure of a cell is linked to its function
      • Cells with many mitochondria need  energy
        • e.g. Muscle cell, sperm cell
      • Cells with many ribosomes' make a lot of protein
        • e.g. Gland cells which produce enzymes
      • Cells with tails can move
        • e.g. sperm cells
      • Receptor cells can detect stimuli
        • e.g. cone cells in the eye are sensitive to light
      • Neurons carry impulses receptors to CNS
        • CNS -  Central Nervous System
      • Plant cells with many chloroplasts will be photosynthesising
        • e.g. Mesophyll cells of a leaf
      • Root hair cells increase surface area of root to absorb minerals ions & water
    • Diffusion
      • Molecules in liquids & gasses move because of the energy they have
      • Is the spreading out of particles
      • Net Movement into or out of cells
      • movement from areas of high concentration to low
      • CONCENTRATION GRADIENT - difference in concentration
      • Larger difference in concentration, faster the rate of Diffusion
    • Bacteria & Yeast
      • Bacteria are much smaller than plant & animal cells
      • Bacteria cells do not have a nucleus
      • Yeas is a single-celled organism
      • Bacteria multiply to form colonies
      • Bacteria have a cell membrane & a cell wall around cytoplasm
  • Is a muscular tube which  digests food


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