NEET (NTA)-National Eligibility cum Entrance Test (Medical) Biology Human Physiology-Digestion and Absorption Revision (Page 4 of 23)

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Introduction and functional organization of Human Digestive System

The gastro-Intestinal Tract (GIT) is designed to provide nutrition to the body. It forms the gate through which nutritive substances enter in the body, they are digested, nutrients are absorbed and unusable substances are removed from the body. It is a tubular structure open at both the ends. Total length of GIT is about 10 meters (30 feet in adults). Food enters from mouth it is chewed and mixed with saliva. It passes into the pharynx, then into the oesophagus which is 25 cm long. T

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Part of GIT: Mouth

Diagram of the mouth

Diagram of the Mouth

Understanding the elements of mouth

GIT begins from here. Mouth itself begins from lips and ends into pharynx. It contains tongue and teeth. Three pairs of the ducts of three salivary glands open here. It has two parts

  • Vestibule; is a slit like space bounded externally by lips and internally by gums and teeth.

  • Oral/buccal cavity; is inner part of mouth it includes;

    • Palate; the roof of buccal cavity is called palate. Anterior part of it is hard palate whic

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