Salivary Glands and Saliva. Saliva is produced in and secreted from salivary glands. The basic secretory units of salivary glands are clusters of cells called an acini. These cells secrete a fluid that contains water, electrolytes, mucus and enzymes, all of which flow out of the acinus into collecting ducts.ost animals have three major pairs of salivary glands that differ in the type of secretion they produce: 1  parotid glands produce a serous, watery secretion. 2  submaxillary (mandibular) glands produce a mixed serous and mucous secretion. 3  sublingual glands secrete a saliva that is predominantly mucous in character.
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At present there are many interesting, good-paying jobs and the outlook is good for newly degreed geologists. Geology salaries vary by employment sector. The graph at right shows the average starting salary of a petroleum geologist with zero to two years experience.It clearly shows that oil companies are willing to pay handsome salaries to new geologists. At the time of the most recent AAPG salary survey new geologists were earning an average of about $83,000.rticles About Volcanoes. Graph of average annual salaries of geologists in the petroleum industry as published by the American Association of Petroleum Geologists as part of the AAPG Annual Salary Survey. These represent employees in the petroleum industry with zero to two years of experience.