Gas exchange surfaces Quiz
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5 questions, one answer each
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1. What is the SA:V ratio of a cube of side 3 cm?
- A. 1 : 1
- B. 2 : 1
- C. 3 : 1
- D. 6 : 1
2. Which pair of factors in Fick's law increases the rate of diffusion?
- A. Greater thickness and larger area
- B. Smaller area and larger difference
- C. Larger area and larger concentration difference
- D. Greater thickness and smaller difference
3. Which adaptation of the lung shortens the diffusion distance?
- A. Walls one cell thick
- B. Many alveoli
- C. Ventilation
- D. Blood flow
4. A surface has area 10, concentration difference 4 and thickness 0.5. What is the relative rate?
- A. 8
- B. 20
- C. 80
- D. 0.2
5. Why does breathing faster during exercise increase the rate of diffusion of oxygen?
- A. It increases the thickness of the wall
- B. It reduces the number of alveoli
- C. It makes the lining drier
- D. It keeps the oxygen concentration in the alveoli high, keeping a steep gradient