For gas exchange to be efficient, the respiratory membrane must be ________.
A. at least 3 micrometers thick
B. 0.5 to 1 micrometer thick
C. between 5 and 6 micrometers thick
D. The thickness of the respiratory membrane is not important in the efficiency of gas exchange.
Answer:B
For gas exchange to be efficient, the respiratory membrane must be ________.
A. at least 3 micrometers thick B. 0.5 to 1 micrometer thick C. between 5 and 6 micrometers thick D. The thickness of the respiratory membrane is not important in the efficiency of gas exchange.