Which structure aid in the mechanical digestion of foods in human beings?

The primary structures that aid in the mechanical digestion of food in humans are the teeth and the stomach. Teeth break down food into smaller pieces through chewing, which increases the surface area for digestive enzymes to act upon. The stomach further aids mechanical digestion by churning and mixing the food with gastric juices, effectively liquefying it and facilitating chemical digestion. Together, these processes prepare food for absorption in the intestines.