The task of the digestive system of the human body is to decompose nutrients such as fats, carbohydrates, vitamins and proteins by chemical means to such an extent that they can be absorbed
by the intestinal capillaries.
The digestive organs include the digestive tract with mouth (os), esophagus (esophagus) and gastro-intestinal tract, as well as the digestive glands with the salivary glands (glandulae
salivariae), pancreas (pancreas) and liver (hepar). Most of the digestive organs are located in the abdominal cavity.
The digestive organs can also be divided according to functions into head and trunk digestive organs. The head organs include the oral cavity, the salivary glands and the upper and middle
throat. The other organs and glands, from the esophagus to the rectum including the glands, belong to the trunk digestive system.
The upper and middle sections of the digestive system reduce the food we eat into smaller pieces and liquefy it, then split it into its constituent substances and transport the resulting
solute nutrients into the blood and lymphatic vessels. The lower section of the digestive tract serves to eliminate the non-solute substances while reabsorbing water.
These tasks are performed in the various parts of the digestive system in cooperation with numerous enzymes produced by the digestive glands. The foods are cut into smaller pieces and
taken apart so that they can be absorbed by the mucous membrane of the gastrointestinal tract.
To maintain what is call the metabolism of activity and the vital functions involved with it, energy is obtained by combusting (oxidizing) the nutrients. In the metabolic process, the
energy thus obtained is stored in the form of organic substances and transformed into mechanical work (muscle contractions) and chemical work (maintaining the balance between the extracellular
and intracellular spaces).
How much energy the body requires depends on a number of factors. The amount need for basic life functions varies according to age, weight and sex. Another important factor is the amount
of physical work a person does.
Important factors in digestion and the energy obtained by its processes include a balanced diet, mainly a combination of protein, carbohydrates and fats. Other vital nutrients include
vitamins, minerals, trace elements and water. Roughage is required for the intestinal function. Human digestive tract diagrams are available for review.
The Human 3D software contains many detailed images and color animations dealing with the Human digestive system.
more information about Human 3D software
