Gas exchange takes place by the physical process of diffusion. Use the diagram to describe where diffusion is occurring and what gases are diffusing. 
Identify and describe what type of respiration involves the lungs (A) and what type involves the tissue fluids (B).A: ________ RespirationB: ________ RespirationDescribe what is occurring, in terms of gaseous exchange, at C, D, E and F.C: ________D: ________E: ________F: ________
What will be an ideal response?
A: External respiration is the gas exchange that takes place between the air and the blood within the lungs.
B: Internal respiration is gas exchange between the blood and the tissue fluid. The body's cells exchange gases with the tissue fluids, which then exchange gases with the blood.
C: At (C), O2 is diffusing from the air, into the blood within the lungs.
D: Blood transports O2 to the tissues and at (D), O2 diffuses from the blood into tissue fluids and then into tissue cells.
E: At (E), CO2 is diffusing out of the tissue cells and tissue fluid into the blood.
F: At (F), CO2 is diffusing out of the blood into the lungs.
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