Copper is used as medicine. Copper is used for treating copper deficiency and the anemia it may cause. Having too little copper (copper deficiency) is rare. It sometimes occurs in people who get too much zinc from diet or supplements, have intestinal bypass surgery, or are fed by feeding tubes.
A goblet cell is a glandular, modified simple columnar epithelial cell whose function is to secrete gel-forming mucins, the major components of mucus.
Goblet cells normally line the intestines, not the esophagus. When goblet cells develop in a place where they are not supposed to be, like the lining of the esophagus, it is called intestinal metaplasia.