D) Excretion
Small amounts of water, salts, and several organic compounds,
components of perspiration, are excreted by sweat glands.
E) Synthesis of vitamin D
The skin is the site of Vitamin D production which results from the
ultraviolet-mediated conversion of precursors. Vitamin D is a substance that aids in the
absorption of calcium and phosphorus.
F) Immunity
Cells of the skin assume a role in bolstering immunity, your ability
to fight disease by producing antibodies.