MODE OF NUTRITION IN HUMAN BRIEF NOTE

THE ALIMENTARY CANAL IS COILED,MUSCULAR TUBE EXTENDING FROM THE MOUTH TO THE ANUS.IT IS ABOUT 6-9 M LONG AND CONSIST OF MANY SPECIALISED SECTION .THESE ARE MOUTH ,ORAL CAVITY,PHARYNX,OESOPHAGUS,STOMACH,SMALL INTESTINE,LARGE INTESTINE,RECTUM AND ANUS.ALSO SOME ACCESARY DISESTIVE ORGAN LIKE SALIVERY GLANDS,PANCREAS,LIVER,AND GALL BLADDER.ARE CONNECTED TO THE MAIN SYSTEM BY THE SERIES OF DUCTS.

           THE MOUTH IS AN OPENING AND IS PROTECTED BY UPPER AND LOWER LIPS.IT LEADS INTO THE ORAL CAVITY THAT HAS TWO LATERAL WALLS,AN ANTERIOR ROOF ,A POSTERIOR ROOF AND A PAIR OF JAWS.

THE ORAL CAVITY LEADS THROUGH THE PHARYNX INTO THE TUBE LIKE OESOPHAGUS WHICH RUNS DOWNWARDS THROAT AND THORAX .AND THE STOMACH IS A LARGE MUSCULAR C SHAPED SAC AND LOCATED ON LEFT SIDE IN UPPER PORTION OF THE ABDOMINAL CAVITY. IT HAS THREE REGIONS -FUNDUS ,BODY AND PYLORUS. PYLORUS IS GUARDED BY SPHINCTER MUSCLES AND OPENS INTO THE FIRST SECTION OF THE SMALL INTESTINE CALLED DUODENUM WHICH IS U SHAPED.THE COMMON BILE DUCT OPENS INTO THE DUODENUM AND DRAINS INTO ITS JUICES FROM PANCREAS AND LIVER.THE DUDENUM LEADS INTO JEJUNUM .WHICH IS ALSOA BITCOILED AND LONGER.THE LAST PART OF THE SMALL INTESTINE THE ILEUM IS MUCH LONGER AND MORE COILED.IT OCCUPIES THE LOWER PART OF THE ABDOMINAL CAVITY.

THE SMALL INTESTINE LEADS INTO A MUCH SHORTER LARGE INTESTINE OR COLON.IT IS CALLED LARGE BECAUSE OF ITS LARGER DAIMETER AND THE COLON EMPTIES INTO THE LAST PART OF THE INTESTINE THE RECTUM,WHICH IS A SHORTAGE CHAMBER FOR FAECES.