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KS3 Biology:

Gas Exchange

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Q1-4: These questions are about the structure of the human respiratory system:

respiratory system

1. What is a common name given to the 'trachea'?

  • A. the gullet
  • B. the windpipe
  • C. the throat
  • D. the voice box

2. The trachea splits in two, heading to the left and right lungs. These two branch tubes are called..

  • A. lungi (left and right lungoles)
  • B. bronchi (left and right bronchus)
  • C. thorax
  • D. diaphragm

3. Air passes into smaller and smaller tubes, eventually reaching tiny sections of air sacs called...

  • A. alveoli
  • B. raveoli
  • C. bronchi
  • D. trachi

4. There are estimated to be 6 million of these tiny sections of air sacs in our body. Why are there so many?

  • A. to give a large distance for air to travel
  • B. to give a very large lung volume for gas exchange to take place
  • C. to give a very large surface area for gas exchange to take place
  • D. to ensure that if some are damaged, others will still function

5-9: This diagram shows how these air sac sections are responsible for exchanging gases in and out of the blood.

5. What is gas X passing into the blood stream?

  • A. oxygen
  • B. nitrogen
  • C. carbon dioxide
  • D. methane

6. What is gas Y passing out of the blood stream?

  • A. oxygen
  • B. nitrogen
  • C. carbon dioxide
  • D. methane

7. What is the name given to the tiny blood vessels (tubes) shown in the digram above?

  • A. arteries
  • B. capillaries
  • C. veins
  • D. aorta

8. Every cell in our bodies need to use glucose and gas X (shown above) in a chemical reaction to release energy. What is the scientific name for this reaction?

  • A. diffusion
  • B. perspiration
  • C. combustion
  • D. respiration

9. There is a high concentration of gas X in the air, and a low concentration in the blood shown in the diagram above. This means gas X pass into the blood in a process called..

  • A. diffusion
  • B. perspiration
  • C. combustion
  • D. respiration