Final answer:
The five organs aiding in digestion through secretions are the salivary glands, liver, gallbladder, pancreas, and the gastrointestinal mucosa which produces digestive hormones. They release enzymes and other substances that break down food into nutrients, regulated by hormones in response to food consumption.
Step-by-step explanation:
There are five organs that participate in producing secretions that aid digestion, primarily through the release of enzymes and other chemical substances. These include the salivary glands, which produce saliva containing enzymes that begin the process of starch digestion in the mouth. The liver produces bile, which emulsifies fats, making them more accessible to digestive enzymes. The gallbladder stores and concentrates bile, releasing it into the small intestine when needed. The pancreas produces a broad spectrum of enzymes that break down all categories of foodstuffs and secretes bicarbonate to neutralize stomach acid entering the small intestine. Lastly, the mucosa of the gastrointestinal tract produces hormones such as gastrin, secretin, and cholecystokinin that regulate the secretion of these digestive juices.