Which of the following organs is NOT involved in digestion?

The heart is not involved in the digestion process. The primary function of the heart is to pump blood throughout the body, delivering oxygen and nutrients to tissues and organs while removing waste products. In contrast, the mouth, stomach, and intestines play significant roles in digestion.

The mouth is the starting point for digestion where food is mechanically broken down by chewing and mixed with saliva, containing enzymes that begin to break down carbohydrates. The stomach further processes food using gastric juices, which contain acids and enzymes to break down proteins. The intestines then continue the digestive process, absorbing nutrients and water from the food as it passes through.

Understanding the specific functions of these organs highlights why the heart is not associated with the digestive system. It focuses on circulation and does not engage in the chemical or mechanical processing of food.