Two basic types of acinar epithelial cells exist: Acini in the parotid glands are almost exclusively of the serous type, while those in the sublingual glands are predominantly mucous cells. In the submaxillary glands, it is common to observe acini composed of both serous and mucous epithelial cells. submaxillary (mandibular) glands-produce a mixed serous and mucous secretion. 2  sublingual glands-secrete a saliva that is predominantly mucous in character. 3  serous cells, which secrete a watery fluid, essentially devoid of mucus. 4  mucous cells, which produce a very mucus-rich secretion.
exploratory - serving in or intended for exploration or discovery; an exploratory operation; exploratory reconnaissance; digging an exploratory well in the Gulf of Mexico; exploratory talks between diplomats. explorative. nonexplorative, nonexploratory, unexplorative, unexploratory - not exploratory.
Here is a graphic example of exploratory research and descriptive research in he Humanities: examining the contents of an archive is exploratory research. The examination was performed in accordance with a preconceived plan. Describing and defining specific finds from that archive is descriptive research.