6.3 gas exchange in fish

Question 1

what is the type of exchange in fish with high activity?

Answer 1

countercurrent

Question 2

how does diffusion of oxygen work with countercurrent diffusion?

Answer 2

• blood rich in oxygen meets with water high in oxygen
• blood and water move in opposite directions

Question 3

what are the advantages of countercurrent flow?

Answer 3

diffusion gradient is maintained throughout lamella

Question 4

describe the structure of the gas exchange system in aquatic organisms.

Answer 4

• gill bar perpendicular to gill filaments
• gill lamellae in filaments