Describe the secretory function of digestive system.

The digestive system performs various functions critical to maintaining homeostasis, one of which is the secretion of substances necessary for digestion and absorption. The secretory function involves the production and release of enzymes, hormones, and other substances by different glands and organs, each contributing to the breakdown of food into absorbable molecules.

Salivary glands initiate the secretory process. These glands include the parotid, submandibular, and sublingual glands, which collectively secrete saliva. Saliva contains water, electrolytes, mucus, and enzymes like salivary amylase and _____ ________ ____ _____ ________.
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