Which of the following digestive secretions functions as a "chemical messenger"?

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Hormones are digestive secretions that act as chemical messengers to regulate digestive processes, such as the release of other digestive secretions and the contraction of muscles in the gastrointestinal tract. Mucus is a lubricating secretion that protects the lining of the gastrointestinal tract. Enzymes are digestive secretions that break down food molecules into smaller units. Chyme is the mixture of partially digested food and digestive secretions that moves through the gastrointestinal tract.

Which of the Following Digestive Secretions Functions as a "Chemical