Other questions in this quiz

2. what do veins do?

  • take blood from organs to heart
  • take blood from heart to lungs
  • allow substances to pass out of blood

3. what is blood made out of?

  • red blood
  • plasma, red blood cells, white blood cells, platelets
  • just red blood cells

4. what are arteries made from?

  • thin walls with valves
  • thick walls of muscle and elastic fibres
  • narrow thin walls

5. what is and artificial pacemaker?

  • take the blood to the organs from the organs
  • electrical device used to correct irregularities in the heart rate
  • a group of cells in right atrium which act as a pacemaker

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