6. The professor explains the digestive process by presenting two separate concepts.
--> Concept is digestive process, following contents would be two methods, not another concept.
First, he describes the mechanical digestion. In this process, foods are crushed into smaller pieces by the physical force of the teeth. Each tooth plays a different role during the process. The sharp teeth are responsible for biting and tearing the food. And the flat teeth grind the food into smaller parts.
Second, he describes the chemical digestion. In this process, enzymes break the food into basic elements that can be used by cells as a nutrient. In the stomach, proteins and fats are broken into nutrients by a specific enzyme produced from the stomach. In the small intestine, starches and amino are transformed into matters for cells by another enzyme.
Two processes consist of the whole digestive process.
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