When vitamin A is deficient,all of the following occur EXCEPT:

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Vitamin A deficiency leads to improper differentiation of epithelial cells, increased production of keratin (a hard protein found in hair and fingernails), and an increased likelihood of infection. It does not cause epithelial cells to produce too much mucus; in fact, it can lead to decreased mucus production, making mucous membranes dry and more susceptible to damage and infection.

When Vitamin a Is Deficient,all of the Following Occur EXCEPT