Question 10

Digestion begins in the oral cavity.

The process of digestion starts in the oral cavity, where food is mechanically broken down by chewing and mixed with saliva containing digestive enzymes that initiate the breakdown of carbohydrates.

A) Small intestine

The small intestine is primarily responsible for the further digestion and absorption of nutrients after food has been processed in the oral cavity and stomach. It does not mark the beginning of digestion but rather a later stage in the digestive process.

B) Oral cavity

This option is correct as digestion begins in the oral cavity where the food is first mechanically broken down by teeth and chemically processed by saliva, setting the stage for subsequent digestion in the stomach and intestines.

C) Esophagus

The esophagus serves as a passageway for food to travel from the oral cavity to the stomach. While it plays a crucial role in transporting food, it does not engage in the digestive process itself.

D) Sternum

The sternum is a bone in the chest that has no involvement in the digestive system. It does not participate in digestion or the processing of food in any way.

Conclusion

The oral cavity is definitively where digestion begins due to the mechanical and enzymatic actions that occur during the initial stages of food processing. All other options represent parts of the digestive system that do not initiate the digestive process, thereby confirming that the oral cavity is the correct answer.