Have you ever wondered what the difference is between a fat that is liquid and a fat that is solid at room temperature? Let's begin by explaining why room temperature fats are solid or liquid. Fats are liquid or solid according to their chemical make up or how their building blocks are stacked together.
Confidence votes 1.6K. Carbohydrate digestion begins in the mouth, and is broken down with the enzymes in saliva. Protein digestion starts in the stomach, and is broken down with pepsin. Fats are digested in the small intestine using bile and other chemicals.
Key Points. 1  Mechanical and chemical digestion begin in the mouth with the chewing of food and the release of saliva, which starts carbohydrate digestion. 2  The epiglottis covers the trachea so the bolus (ball of chewed food) does not go down into the trachea or lungs, but rather into the esophagus.