AQA Biology Unit 3 (B3) Mindmap

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  • Created by: Triciaaa
  • Created on: 14-04-13 19:17
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  • Biology Unit 3
    • Transport systems in plants and animals
      • The Blood System
        • Double circulatory System deoxygenated blood > lungs > oxygenated blood > heart > pumped around body
        • Arteries thick walls, muscle elastic tissue, contracts, prevent blood flow
        • Veins - thin walls, low pressure,  valves
        • Capillary narrow thin walled blood vessels
        • Stents, heart valves
      • The Blood
        • Red blood cells, white blood cells, platelets
        • Plasma transports C02, soluble products and urea to places
      • Transport  Systems in Plants
        • Xylem
          • transports water and mineral ions from root to    stem+leaves
          • constant movement = transpiration stream
          • thick rigid walls to prevent from falling
        • Phloem
          • Dissolved sugars from leaves to rest of plant (storage regions)
          • Sieve tube = no nucleus, but living tissue
          • End walls = holes make movement easy
          • companion cells = sugars transported by AT
    • Humans and their environment
      • Deforestation
        • Why? Timber, more land for crops and locals
        • Impacts: more methane,c02, biodiversity
        • peat bogs absorb c02 (peat free compost,less demand for peat
      • Biofuels
        • Ethanol produced from sugar and maize
        • Benefits: carbon neutral, cheap raw materials, clean, no pollutant gases
        • Costs: carbon neutral, modifying cars, cellulose goes to landfill, expensive
      • Waste from Human Activity
        • Reasons:  green and industrial revolution, hygiene, medecine
        • Impacts: loss of habitat, raw materials, lots of waste
      • Climate Change
        • Consequences: loss of biodiversity, migration  patterns, distribution, sea level rise
      • Food production
    • Homeostasis
      • Removal of waste and water control
        • Kidney Dialysis and transplants
        • Kidneys remove urea from blood, adjust ions and water in the blood
        • thermore gulatory centre, personal thermostat
        • body temp, water+ion content,blood sugar level
      • Sugar Control
        • Insulin - lowers blood glucose level
        • Glucagon- increases  blood glucose level
        • Type 1 diabetes - pancreas  doesn't secrete insulin
    • Movement of molecules in and out of cells
      • Exchange  Systems in Plants
        • Root hair cells - long hairs, large SA uses active transport
        • Increase in transpiration rate: hot, dry windy
        • Stomata closes when transpiration increases
        • guard cells lose water, deflate, cells no longer curve, close up
      • Gaseous Exchange
        • Inspiration - intercostal muscles contract, thorax volume increases, pressure decreases, air draws in
        • Expiration- intercostal muscles relax, thorax volume decreases, pressure increases, air forced out
      • Dissolved Subs
        • Osmosis,  Diffusion and Active Transport
        • Exchanging materials: large SA, thin, good blood supply, ventilates
        • Alveoli - large SA, thin alveolus wall, ventilated, blood supply from RBC
        • Villi - large SA (microvilli)  thin, good blood supply
  • Movement of molecules in and out of cells
    • Exchange  Systems in Plants
      • Root hair cells - long hairs, large SA uses active transport
      • Increase in transpiration rate: hot, dry windy
      • Stomata closes when transpiration increases
      • guard cells lose water, deflate, cells no longer curve, close up
    • Gaseous Exchange
      • Inspiration - intercostal muscles contract, thorax volume increases, pressure decreases, air draws in
      • Expiration- intercostal muscles relax, thorax volume decreases, pressure increases, air forced out
    • Dissolved Subs
      • Osmosis,  Diffusion and Active Transport
      • Exchanging materials: large SA, thin, good blood supply, ventilates
      • Alveoli - large SA, thin alveolus wall, ventilated, blood supply from RBC
      • Villi - large SA (microvilli)  thin, good blood supply
  • Double circulatory System deoxygenated blood > lungs > oxygenated blood > heart > pumped around body
  • Glucagon- increases  blood glucose level

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