supplying the cell b2.1

  • Created by: faiqa1331
  • Created on: 11-10-18 05:49
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  • supplying the cell b2.1
    • diffusion (b2.1.1)
      • passive
      • movement of particles from an area high concentration to an area of low concentration
      • rate increased by:
        • short diffusion distance
        • higher concentration gradient
        • larger surface area
    • osmosis (b2.1.2)
      • movement of water molecules from an area of high concentration to an area of low concentration
      • across a partially permeable membrane
      • example:water into root hair cells
    • active transport (b2.1.3)
      • requires energy (atp)
      • movement of molecules against a concentration gradient
      • lots of mitochondria is needed
      • you get the atp from respiration
    • mitosis (b2.1.4)
      • method by which cells replicate
      • body cells divide into to genetically idenical daughter cells
      • 1) interphase:
        • the dna replicates
        • other oraganells replicate
        • the cells grow bigger
      • 2) mitosis
        • i) the chromosomes line up in the middle of the cells
        • ii) the chromosomes are pulled to opposite ends
        • iii) two new nuclei are formed which will 46 chromosomes each
      • 3) cytokenis
        • i) the cell membrane pinches in and two new daughter cells are made
        • ii) the daughter cell will now grow and perform mitosis
    • cell differentiation (b2.1.5)
      • sperm cell
        • tail = swim
        • mitochondria = energy
        • acrosome = enzymes to digest cell membrane
      • fat cell
        • small cytoplasm = large fat reserve
      • red blood cell
        • no nucles
        • biconcave
        • lots of haemoglobin
        • carries oxygen
      • cilliated cell
        • the cilia = move substances along
    • stem cell (b2.1.6)
      • undifferentiated cells
      • divide for growth or repair
      • plants
        • found in meristems
      • animals
        • embryonic
          • found in embryo
          • can differentiate into all cells
        • adult
          • found in body tissue
          • can differentiate into some cells

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