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What helps in the passing of inorganic ions?

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What helps in the passing of inorganic ions?

(a) Ion channels

(b) Voltage gated channels

(c) Aqueous filled pores

(d) Diffusion

This question was posed to me in an online interview.

Question is from Gastrointestinal Absorption of Drugs topic in section Absorption of Drugs of Drug Biotechnology

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Right option is (c) Aqueous filled pores

Explanation: Aqueous filled pores of diameter ranging from 4 to 10 Å helps to pass small organic water-soluble molecules and inorganic ions. These pores have polar amino acid on the inner side of the pore which helps the water-soluble molecules to easily pass through them.

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