part of part of goblet cell respiratory tract goblet cell 2010-09-23T04:42:27Z A simple columnar epithelial cell that secretes mucin. Rough endoplasmic reticulum, mitochondria, the nucleus, and other organelles are concentrated in the basal portion. The apical plasma membrane projects microvilli to increase surface area for secretion. respiratory mucosa goblet cells respiratory goblet cell respiratory tract secretory epithelial cell respiratory tract epithelium