Distribution of Human Internal Organs

The human body is located in most of the body cavity but directly or indirectly with the body outside of the organs of the general term, including digestion, respiratory, urinary and reproductive four systems. According to their morphology and structure, they are divided into two categories: luminal organs and parenchymal organs. Luminal organs have ducts that communicate with the outside world; the parenchymal organs are mainly glands that open into the walls of the luminal organs with ducts.

From the point of view of individual occurrence, the digestive and respiratory systems derive most of their **** from the same endoderm; the respiratory organs are another duct protruding ventrally from the upper portion of the primitive alimentary canal. The urinary and reproductive organs are derived from the urogenital crest of the mesoderm, and have evolved and differentiated into the urinary and reproductive lineages with different functions, but in males there is still a section of the ****same excretory duct, and thus the two lineages of urine and reproduction have been referred to together as the urogenital lineage.

Expanded information:

The human body stomach's digestive function is mainly embodied in two aspects, first, to food The first is the grinding of food, and the grinding of the stomach is always there whether there is food or not, about three times per minute; the second is to dissolve food through the stomach acid to promote digestion.

The various physiological movements of the stomach are mainly accomplished by the muscular layer of the stomach wall, which is very well developed and consists of three layers of smooth muscle. Smooth muscle has a large stretch, the longest can be 2-3 times longer than the original length.

Baidu Encyclopedia - Organs of the Human Body