The nursing instructor is explaining mechanisms of substance transport across the placenta. Which substances require facilitated diffusion? (Select all that apply.)
A.
Carbon dioxide
B.
Fatty acids
C.
Globulins
D.
Glucose
E.
Oxygen
ANS: D, E
Glucose and oxygen require facilitated diffusion to cross the placenta. Carbon dioxide and fatty acids move by simple diffusion. Globulins move via pinocytosis and endocytosis.
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