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Which of the following mechanisms is utilized by a drug that permeates across epithelial tight junctions...

Which of the following mechanisms is utilized by a drug that permeates across epithelial tight junctions powered by a concentration gradient?

A. Aqueous diffusion

B. Simple diffusion

C. Facilitated transport

D. Endocytosis and Exocytosis

E. Pinocytosis

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Homework Answers

Answer #2

Answer is option C. Facilitated transport.

Aqueous diffusion: Movement of aqueous particles across epithelial tight membrane.  

Simple diffusion: The substance passes through a membrane without any aid.

Facilitated diffusion: Passive movement of molecules along their concentration guided by another molecule.

Endocytosis: Taking in of a substance by a living organism.

Exocytosis: It is a form of active transport in which cells throw the molecules out of the membrane .

Pinocytosis: Ingestion of liquid into the cells.

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