From tiny blood cells/vessels!
Hope this helps!
Answer:
Consider substances that can easily diffuse through the lipid bilayer of the cell membrane, such as the gases oxygen (O2) and CO2. O2 generally diffuses into cells because it is more concentrated outside of them, and CO2 typically diffuses out of cells because it is more concentrated inside of them.
"Yes, as long as your spouse wears a mask and stays at least 3 feet away from you."
