Why Is Gas Exchange in an Aquatic Environment More Challenging

question 64

Multiple Choice

Why is gas exchange in an aquatic environment more challenging than gas exchange in the air?

• A) The countercurrent exchange process limits the amount of oxygen that can be extracted from water.
• B) The large surface area of gills makes them more susceptible to drying out.
• C) Gills have a poor blood supply.
• D) Less oxygen is available in water than in air.
• E) Carbon dioxide is eliminated by active transport in an aquatic environment.