Why can some medicines be absorbed through the skin?

Explanation:

Some medication can be absorbed through the skin as the skin or mucous membranes allow it to enter through the body. Most drug absorbtion occurs between cells by passing through sweat pores and hair follicles, making it transcellular. Thus, topical medication is able to be absorbed through the skin due to pores and hair follicles.

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during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.