B3 exam 0.0 / 5 ? BiologyGCSEAQA Created by: RomillyCreated on: 28-04-13 17:22 Name four factors which make exchange surfaces as effective as possible Large surface area, thin (short diffusion path), good/efficient blood supply (only in animals), are ventilated (only in animals) 1 of 14 What blood vessel has a very small lumen and is very thin? Capillaries 2 of 14 What blood vessel has valves? Veins 3 of 14 What blood vessel has strong elastic fibers? Arteries 4 of 14 How are red blood cells adapted to their job? Concave shape, flexible, no nucleus, hymoglobin 5 of 14 What do platelets do? Clot the blood to stop microorganisms and bacteria getting in to a wound. 6 of 14 What is carried in the plasma? Red and white blood cells, platelets, glucose, amino acids, hormones, carbon dioxide, urea, antibodies and antitoxins 7 of 14 Name three circulation aids Artificial blood, artificial heart parts and stents 8 of 14 What needs to be controlled in the body? Body temperature, glucose levels, water content, ion content, carbon dioxide and urea. 9 of 14 There is less land, due to what human activity? Building, farming, dumping waste in landfill and quarrying. 10 of 14 Where is carbon dioxide stored naturally? Oceans, lakes, peat bogs and green plants. 11 of 14 What can be used to produce biogas? Sewage waste, animal waste, plant waste and waste from sugar factories. 12 of 14 What are some environmental factors of bio fuels? Are carbon neutral, doesn't release pollution, better fertiliser, waste disposal system and methane is used up not released into the atmosphere. 13 of 14 What are some economic factors of bio fuels? Cheap raw material, cheaper to buy and better for developing countries. 14 of 14
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