Gas Exchange in Organisms
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Gas Exchange in Organisms
Build the core idea
Gas exchange depends on diffusion across a thin, moist surface. Diffusion is the net movement of particles from a region of higher concentration to a region of lower concentration.
- Alveolus
- Gill lamella
- Spiracle
- Tracheole
- A
- C
- D
- B
- Oxygen moves from blood into the alveolus because blood has more oxygen.
- Oxygen moves from alveolar air into blood because alveolar oxygen concentration is higher.
- Carbon dioxide is actively pumped from blood into the alveolus using ATP.
- Both gases always move in the same direction.
Apply the evidence
A class measures oxygen uptake in a small aquatic organism under two conditions. Results are averaged from repeated trials.
Condition
Water temperature
Oxygen uptake (mg O₂ per hour)
A
12°C
4.2
B
20°C
6.8
3 printable pages
Page 1
Page 2
Page 3
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