DIGESTIVE SYSTEM
The digestive system comprises of the gastrointestinal tract with various gland attached to it The tract starts from the mouth and ends at the anus the tract is 8-10 meters in length and from above downwards it is subdivided into ::1.Mouth 2.Pharynx 3.Oesophagus 4. Stomach 5. Small intestine 6. Large intestine 7.Rectum 8.Anal canal and 9.Anus
The digestive tract is a long tube the stomach being its highly dilated part The small intestine is coiled up in the abdomen and the large intestine is like an arch transverse colon arching with ascending and descending colon as its pillars on either side continuing into a bent pelvic colon and then a straight rectum ending in the anus which opens to the exterior of the body
ORAL CAVITY::
This is the first enlarged part of the tract it opens externally through upper and lower lips The cavity has dome shaped roof is called the palate the hard palate is in front and the soft palate is behind this forms an arch with uvula hanging behind in the center pharyngeal tonsils which form the lymph glands are on the either side and work like gate keepers protecting against the infection of the adjacent area
In the oral cavity food is teared and grinded with the help of teeth and it is also mixed thoroughly with saliva the food bulk at this time is referred as bolus the process of tearing grinding and mixing with saliva involves movement of jaws cheeks lips and tongue this process is known as mastication
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