Other questions in this quiz

2. what does the elastic fibres of an artery do

  • ensure that there is thick outer walls to protect them from bursting due to high pressure
  • ensure it is smooth to allow efficient blood flow
  • recoil, which allows normal conditions to return after contraction
  • contract and increase blood pressure

3. why are long term drug trials useful

  • to ensure that the drug is safe and that it works. it also is used to identify any long-term side affects that don't happen imediately
  • because they show any humans that don't like it
  • because it shows whether the drug is available for long-term use (supply)

4. what do the different types of white blood cells do

  • one engulfs and digests the micro-organism and the other makes antibodies
  • they all engulf and digest the micro-organisms
  • one engulfs and digests the micro-organism and the other makes antigens
  • one engulfs and digests the micro-organism the other sticks to the micro-organism

5. how does a heart attack occur

  • coronary arteries carry oxygenated blood to the heart. fat can build up on the artery walls. a blood clot may form on this fat. this may block the artery and stop oxygen getting to the heart. heart cells die and the heart is permanently damaged.
  • when your heart attacks ;)

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