Question

As food passes through the alimentary canal, the presence of chemical secretions will occur in which order?

Answer 1

Chemical secretions occur in the alimentary canal in the following order: salivation, processing by gastric acids and enzymes, production of gastrin, and release of digestive secretions.

Step-by-step explanation:

The presence of chemical secretions in the alimentary canal occurs in the following order:

1. Salivation is triggered: When food enters the mouth, salivary glands are activated to produce saliva, which contains enzymes that begin the digestion process.
2. Food is processed by gastric acids and enzymes: In the stomach, gastric acids and enzymes break down food further.
3. Gastrin is produced: Gastrin is a hormone that is released in the stomach and stimulates the production of gastric acids and enzymes.
4. Digestive secretions are released: As food moves into the small intestine, digestive secretions from the pancreas, liver, and small intestine are released to further break down food.

Answer 2

The alimentary canal includes mouth, esophagus, stomach, small intestine, and large intestine. As food passes through the alimentary canal, it is exposed to the different chemical secretions from the organs of the alimentary canal, as well as from other organs, such as liver and pancreas.
First, in the mouth, salivary glands produce saliva which contains enzymes involved in the food digestions. After the food is passed to the esophagus, it produces mucus to help passage of the food. In the stomach, acid and pepsinogen, as well as mucus are produced. All of these secretions help food digestion. Small intestine also produces some digestive enzymes. Further, bile from liver and enzymes from pancreas are secreted via ducts into small intestine. Finally, large intestine secretes mucus for lubrication.