Other questions in this quiz

2. what does the elastic fibres of an artery do

  • recoil, which allows normal conditions to return after contraction
  • contract and increase blood pressure
  • 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

3. why are cappilary walls very thin (only one cell thick)

  • to allow oxygen and food to diffuse into cells and waste to diffuse out of cells
  • because the blood is at a low pressure
  • because it doesn't carry a lot of blood

4. what happens in most human trials

  • one group takes new drug. the controls (another group) takes a placebo or an existing drug for that illness
  • a group of people take a new drug
  • humans are raced on an Olympic course

5. what does the muscle inside an artery do

  • recoil, which allows normal conditions to return after contraction
  • contract and increase blood pressure
  • 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

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