Concept
Version 9
Created by Boundless
The Respiratory System and Direct Diffusion
Direct diffusion
This flatworm's process of respiration works by diffusion across the outer membrane.
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_02.jpg
OpenStax CNX
CC BY 3.0.