Gas exchange and breathing Quiz
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5 questions, one answer each
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1. What is the name of the two tubes that branch from the trachea?
- A. Bronchioles
- B. Alveoli
- C. Bronchi
- D. Capillaries
2. Which feature of the alveoli gives a short diffusion distance?
- A. Walls that are one cell thick
- B. A moist lining
- C. Millions of alveoli
- D. A tube-shaped structure
3. Which gas moves from the blood into the alveoli?
- A. Oxygen
- B. Nitrogen
- C. Water only
- D. Carbon dioxide
4. Why does a dense network of capillaries around each alveolus help gas exchange?
- A. It makes the alveolus walls thicker
- B. It keeps a steep concentration gradient by carrying gases away and bringing them in
- C. It stops the alveoli becoming moist
- D. It increases the number of alveoli
5. A student says the lungs contain millions of alveoli. Which is the main advantage of this?
- A. The lungs become lighter
- B. The air travels more slowly
- C. A very large surface area for diffusion
- D. The walls become thicker