Gas Exchange in Fish

Question 1

How are fish adapted for gas exchange?

Answer 1

• Water has lower concentration of oxygen compared to the air
• Adapted to have gills which allows them to have direct contact with the oxygen in the water
• Shorter diffusion distance and a larger surface area
• Faster rate of diffusion
• Ensures maximum oxygen for metabolic activity

Question 2

Why can fish not survive on land?

Answer 2

• Water is denser than water which provides buoyancy to the gills - decreases the effect of gravity
• If on land bouncy would decreases as air cannot supports it weight - effect of gravity increases
• Gills collapse and stick together - surface area decreases
• Rate of diffusion of oxygen would decrease

Answer 3

1. Made up of multiple