The substance that helps in the chemical digestion of food is an enzyme. Enzymes are proteins that catalyze or speed up chemical reactions in the body. They play a crucial role in breaking down complex food molecules into smaller, absorbable units during the process of digestion. Examples of digestive enzymes include amylase, lipase, and protease, which help in the breakdown of carbohydrates, fats, and proteins respectively. Epiglottis, gallbladder, and peristalsis are not substances but rather parts or processes involved in the digestive system. The epiglottis is a flap of cartilage that covers the trachea (windpipe) during swallowing to prevent food or liquids from entering the respiratory system. The gallbladder is an organ that stores and releases bile, a substance produced by the liver that aids in the digestion and absorption of fats. Peristalsis is the muscular contraction and relaxation of the digestive tract that helps move food along the digestive system.
