Question

Explain digestive system in humans with the help of a diagram

Answer 1

first we chew the food with our teeth in our mouth .inside mouth there is saliva which releases salivary amylose which break food into smaller substance then food goes through oesophagus by parasitic movement (rhythmic contraction and relaxation movement) food goes to stomach .inside the stomach there is gastric gland present which contains mucus HCl pepsin HCl makes the medium acidic which facilities the function of pepsin. pepsin break proteins present in food into peptons mucus protect the wall of stomach from action of HCl then food goes to small intestine through spinchter muscle .in small intestine liver secrets bile juice which help in emulsification of fats and facilitate function of pancreas pancreas release pancreatic juice which have trypsin for breaking peptons to ammino acid and lipase for further emulsification.small intestine has villi (finger like projection ) which increases area of absorption large intestine only do further absorption (water absorption) remaining food exerts out by anus . hope u like it

Answer 2

The digestive system  is concerned with the breakdown of complex food substances and its conversion in to simpler components , its absorption through the blood stream and  assimilation in the cells and tissues producing desired effects of growth etc.

  Components of the  digestive system  in human  body:
  The digestive system in  human body comprises of the following: 
                                                 MOUTH: 

The mouth or the buccal cavity bounded by the upper and lower lips is the intiation of the digestive system in the human body. Internally, the  buccal cavity is provided with three pairs of salivary glands, namely the parotid, sublingual and submaxillary that produces saliva.

OESOPHAGUS:
The oesophags  is the tubular pathway leading from the mouth to the stomach and is involved ib transport of the bolas by means of involuntary peristalsis .It  is an alternate contraction and relaxation of the circular and longitudinal  muscles that forces the food  downwards.The oesophagus moves thorugh the diaphragm via oesophageal biatus and enters the stomach at the cardiac end through the cardiac sphincter.
STOMACH:
The stomach is a larger sac like organ with a J shaped structure.underr the diaphragm.the stomach  ids divided into four regions -Cardia, surrounding the lower esophqageal sphincter,fundus- rounded portion aboveand to the left of the cardia; body- large central portion below the  fundus and the narrow inferior region called pylorus.
The Concave medial border  of the stomach is called the lesser curvature and the convex border is called the greater curvature. te pyloric region joins with the duodenum through the pyloric sphincter.

LIVER:

 it is the largest digestive gland (i.4kg) occupying  most of the right  half of the abdomen below  the diaphragm and is almost completely covered by peritoneum.It is divided into two major lobes, larger right and smaller left lobe separated by falciform ligament.

GALL BLADDER :
It is a  pear shaped sac  about  7 to 10 cms long and located in ther fossaa of the visceral surface of the liver.It is a store for bile and when intestine is empty,the sphincter of hepatopancreatic ampulla or sphincter of Oddi closes .

PANCREAS:
The pancreas  is an oblong ,tuboacinar gland (12.5 cmsX 2.5 cms)located posterior to the greater curvature of the stomach and is usually connected to the duodenum by two ducts.It has a head, body and tail.The head is expanded and near the  C shaped curve of the duodenum.
the larger  of the two ducts is called the pancreatic duct (duct of Wirsung) , while the smaller one is called the accessory duct or duct of Santorini, leading form the pancreas into the duodnum.

SMALL INTESTINE
 It initiates from the pyloric end of the stomach and consists of anterior (duodenum), middle (jejunum ) and terminal (ileum).this region is specialized by the presence of numerous finger like projections called  villi with efferent and afferent blood vessels that serves in absorption of food  as a part of the digestive system in the human body.

LARGE INTERTINE
 The large intestine or the colon initiates from the ileum of the small  intestine and consists of ascending ,descending and transverse colon.the opening of the ileum and the  colon is guarded by the ileocecal sphincter.it ends in at the rectum and the anus.