Evolution of respiratory organs
Answers are for parents and teachers.
1
A resting person takes 15 breaths a minute. How many breaths in 10 minutes?
150
2
Write one similarity and one difference in breathing between a fish and a frog.
Both have gills when young; a fish always breathes with gills, an adult frog with lungs and skin.
3
Why is the alveolar wall one cell thick?
Gases must diffuse quickly, so the distance must be short.
4
How are breathing and heartbeat linked? What happens to both during exercise?
Exercise needs more oxygen, so breathing and heart rate both speed up.
5
Write the advantage of aerobic over anaerobic respiration.
It yields far more energy from glucose (about 30–32 ATP) than glycolysis (2 ATP).