Exchange of Respiratory Gases in Enteropneusts Is Accomplished at the Pharyngeal

question 45

Multiple Choice

Exchange of respiratory gases in enteropneusts is accomplished at the pharyngeal slits and by

• A)diffusion in alveolar lungs.
• B)active transport in the tracheal system.
• C)diffusion across the body wall.
• D)facilitated diffusion in dermal branchiae.
• E)facilitated diffusion in book gills.