The lungs of a full-term fetus continually secrete surfactant, the purpose of which is to:
a. hold the moist membranes of the lungs together.
b. reduce the surface tension so that the lungs expand more easily.
c. increase the efficiency of the oxygen–carbon dioxide exchange.
d. regulate blood flow from the pulmonary arteries to the lungs.
b
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Most of the countries in the developed world are currently using ICD-9-CM diagnosis codes
Indicate whether this statement is true or false.
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In Wandering Pacemaker, the heart's pacemaker site shifts between:
A) SA node, atria, and AV node. B) SA node, atria, and ventricles. C) AV node and ventricles. D) atria and ventricles.
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