The human digestive system starts with mouth and ends with anus. Intake of food into to mouth is called Ingestion.Mouth encloses a cavity within called Buccal cavity or Oral cavity. Three pairs of salivary glands pour their secretions called saliva in to this cavity. The muscular tongue pushes the food under grinding teeth as it mixes with saliva, this process is called "Mastication". Mastication makes the food into ball of paste. Salivary amylase" an enzyme in saliva starts the digestion of…
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