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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It's not very common for Geologists to move on to become Petroleum Geologists. Average pay for a Petroleum Geologist is $103K annually. The most common next step for a Geologist is to become a Senior Geologist or an Environmental Project Manager. The former position pays an additional $27K per year on average, and the latter position pays $6K more per year.