AQA Biology Unit 3 (B3) Mindmap
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- 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
- Xylem
- The Blood System
- 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
- Deforestation
- 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
- Removal of waste and water control
- 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
- Exchange Systems in Plants
- Transport systems in plants and animals
- 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
- Exchange Systems in Plants
- Double circulatory System deoxygenated blood > lungs > oxygenated blood > heart > pumped around body
- Glucagon- increases blood glucose level
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