[Unit 6.3] | Gas Exchange In Fish

Question 1

Describe the structure of the gills.

Answer 1

• Vonsists of a gill bar

• With many projections called gill filaments which are stacked in a pile.

• Gill lamellae are discs that exist at right angles to the filaments & increase the surface area of the gill.

Question 2

What is a countercurrent flow?

Answer 2

• Where blood & water flow over the gill lamellae in opposite directions.