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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Petroleum engineers working in overseas locations earn varying salaries, though. The Prospects United Kingdom-based careers website says experienced petroleum engineers earn the equivalent of $86,000 to $157,000 annually as of 2013.any oil-rich nations can be found in the Middle East, including in Saudi Arabia, Qatar and Kuwait. The Salary Explorer website says an oil and petrochemical engineer in Saudi Arabia earns an average monthly salary equivalent to $6,027 or about $72,200 annually as of 2014.