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Primary secretion of the liver is the raw secretion of substances by hepatocytes into the bile canaliculi. This kind of secretion has not yet been modified by the epithelial cells lining the bile ducts, which normally increase the amount of bicarbonate ions in the primary secretion as it passes by.

A similar kind of primary secretion is that which is released by the end pieces of the salivary glands, which is later modified by epithelial cells lining the salivary ducts.

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14y ago

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