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6. What is the job of the lungs?

  • To transfer oxygen into the blood and remove waste carbon dioxide.
  • To add oxygen and nitrogen from the air into the blood.
  • To add carbon dioxide to the blood.
  • To thin the blood.

7. Which of these is NOT an adaptation of alveoli?

  • A large surface area.
  • Very thick walls to protect themselves from high pressure.
  • A good blood supply.
  • Most lining for dissolving gases.

8. What is inside the lungs?

  • Villi - for gas exchange.
  • Alveoli - air sacs for gas exchange.
  • Capillaries - to carry the blood.
  • Air - for breathing.

9. What do we need for active transport?

  • A sports machine and a vehicle.
  • Energy to move the particles.
  • A partially permeable membrane.
  • Two areas of equal;y concentrated liquid.

10. What are sports drinks designed to do?

  • Replace the water, sugar and ions lost through sweat.
  • Reward you after exercise.
  • Improve your endurance.
  • Give you dehydration.