Human digestive system length is about 8-10 meter it’s made up of alimentary canal and digestive glands.
Alimentary canal-mouth, oral cavity, oesophagus, stomach, small intestine, large intestine, caecum, colon, rectum.
Digestive glands- Salivary gland, liver, pancreas intestinal gland.
Mouth-made up of two đź‘„lips.
Oral cavity/Buccal cavity-contain tongue, teeth, salivary glands.
In human digestion start in mouth.
Salivary glands-sublingual-below the tongue one pair
Parotid gland-behind the chick one pair
Submaxilary near lower jaw one pair
3pair salivary gland secrets about 1.5 liter saliva that contains salivary amylase/ptylin, Lysozyme, salt, water đź’§that help in digestion of carbohydrates lysozyme kill germs.
B Bhushan science 