By what mechanism does gas exchange across the lung occur?
a. Active transport
b. Facilitated diffusion
c. Facilitated transport
d. Simple diffusion
ANS: D
This close "match" of gas and blood across a large but extremely thin blood-gas barrier membrane enables efficient gas exchange to occur by simple diffusion.
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Discuss what is meant by sequence within a full-body massage routine. What are the typical components of a sequence?
What will be an ideal response?
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If the pulp is exposed but there is no chance for a favorable response, the procedure of choice is ____________
a. indirect pulp treatment b. direct pulp cap c. pulpotomy d. none of the above
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