Which organ is involved in the initial chemical digestion of food?

Which organ is involved in the initial chemical digestion of food?

• A. The stomach
• B. The pancreas
• C. The liver
• D. The esophagus

Answer: (A)

Chemical digestion starts in the stomach, where gastric juice creates a highly acidic environment and the enzyme pepsin begins breaking down proteins into smaller peptides. The acid not only denatures proteins but also activates pepsin from its inactive form, enabling this first stage of protein digestion. While digestion begins in the mouth with saliva, the option shown doesn’t include that site. The esophagus mainly moves food along, and the liver and pancreas mainly contribute digestive components later in the small intestine. So the stomach is the organ where the initial chemical digestion of swallowed food, particularly proteins, occurs.

Chemical digestion starts in the stomach, where gastric juice creates a highly acidic environment and the enzyme pepsin begins breaking down proteins into smaller peptides. The acid not only denatures proteins but also activates pepsin from its inactive form, enabling this first stage of protein digestion. While digestion begins in the mouth with saliva, the option shown doesn’t include that site. The esophagus mainly moves food along, and the liver and pancreas mainly contribute digestive components later in the small intestine. So the stomach is the organ where the initial chemical digestion of swallowed food, particularly proteins, occurs.