Concept
Version 6
Created by Boundless
Skin, Gills, and Tracheal Systems
Oxygen transport and gills
As water flows over the gills, oxygen is transferred to blood via the veins.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Systems of Gas Exchange. October 17, 2013."
http://cnx.org/content/m44792/latest/Figure_39_01_04.jpg
OpenStax CNX
CC BY 3.0.