roughage - Another term for fiber., soluble - Molecules that can easily cross cell membranes., insoluble - Molecules that cannot cross cell membranes., eight - Total number of incisors in an adult human., two - Number of canines in each jaw of an adult human., four - Number of premolars in each adult jaw., eight to twelve - Total number of molars in an adult human., enamel - The outside layer of a tooth., dentine - The material underneath the enamel., peristalsis - Muscle contractions in the walls of the alimentary canal.,

Digestive System

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