Enamel can act in a sense like a:

# Enamel can act in a sense like a:
A. Permeable membrane
B. Impermeable membrane
C. Semipermeable membrane
D. Infrapermeable membrane

The correct answer is C. Semipermeable membrane.

Another physical property of enamel is its permeability. It has been found with radioactive tracers that the enamel can act in a sense like a semipermeable membrane, permitting complete or partial passage of certain molecules: 14C-labeled urea, I, etc. The same phenomenon has also been demonstrated by means of dyes.

Reference: Orban's

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