B3.1 Gas exchange Quiz
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5 questions, one answer each
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1. A cube's side doubles. Its surface area-to-volume ratio:
- A. Doubles
- B. Halves
- C. Stays the same
- D. Quadruples
2. Which keeps the oxygen gradient steep at the alveoli?
- A. Surfactant
- B. Continuous blood flow
- C. Cartilage in the trachea
- D. The waxy cuticle
3. During forced exhalation, which muscles contract?
- A. External intercostals and diaphragm
- B. Internal intercostals and abdominal muscles
- C. Diaphragm only
- D. No muscles; it is passive
4. Tidal volume 0.5 dm³, inspiratory reserve 2.5 dm³, expiratory reserve 1.0 dm³. Vital capacity?
- A. 3.0 dm³
- B. 3.5 dm³
- C. 4.0 dm³
- D. 1.5 dm³
5. Which change would decrease the rate of transpiration?
- A. Higher temperature
- B. Increased wind
- C. Higher humidity
- D. Brighter light