The abdomen is bounded above by the thorax and below by two pelvic bones

below by two pelvic bones. From the cavity of the

thorax it is separated by the diaphragm. Laterally and in front it is enclosed by the lower ribs and abdominal muscles. Behind, it is supported by the spinal column.
2) The digestive system consists of the digestive tract and digestive glands.

is divided into the following parts: oral cavity, pharynx, oesophagus,

stomach, small intestine and large intestine.
4) The liver lies under the right ribs. The liver weighs about 1.5 kg. The liver that secretes bile which participates in the digestive process and has a defensive function.

The gallbladder serves as a bile reservoir.
6) The stomach lies

under the left ribs. The stomach serves as a container of food, which is partly digested in it. Its capacity is some 1-2 litres.
7) The intestines occupy the central portions of the abdominal cavity. From the stomach the food passes in small portions into the small intestine where it undergoes further mechanical and chemical changes. The contents pass into the large intestine.

consists of three coats: internal - mucous, middle - muscular,

and the external - serous.
9)The small glands in this coat secrete a viscous coat of the digestive tract. It facilitates the movement of food and protects the mucous coat from the damage by solid particles of food and various chemical substances.

the esophagus, and the tongue and the soft palate all

contain striated muscle tissue, other organs have smooth muscle tissue. Contractions of the muscular coat move food along the digestive tract.
11)The serous coat that covers the digestive organs in the abdominal cavity is called the peritoneum.

some other substances which take part in the chemical processes

of digestion. Large glands include the salivary glands, the liver and the pancreas.
13)The nervous system regulates the activity of each organ.