Distribution of internal organs in men's body

A general term for the organs of the human body that are mostly located in the kidney tubes but directly or indirectly communicate with the outside of the body, including the digestive, respiratory, urinary and reproductive systems. According to their shape and structure, they are divided into two categories: luminal organs and true organs. The luminal organs all have tubes that communicate with the outside; the true organs are mainly glandular ducts that open into the wall of the luminal organs with soft tubes. From the perspective of individual development, the vast majority of the digestive and respiratory systems come from the endoderm; the vocal organs are another tube that protrudes from the upper part of the original digestive tract to the internal oblique muscle. The urinary and reproductive organs come from the urogenital ridge of the mesoderm. After evolution, they split into the urinary system and reproductive system with different functions, but in men there is still a common excretory duct, so some people call the urinary and reproductive systems the urogenital system.

Category:

1. Digestive tract:

A general term for the digestive system, which consists of the digestive tract and digestive glands.

The digestive tract of the human body is long and winding, including the mouth, pharynx, esophagus, stomach, colon, intestines and anus. The colon is the largest and is the most important place for digestion and absorption of nutrients. It is 5 to 7 meters long and coiled in the middle and lower part of the abdomen. It is divided into the duodenum, jejunum and ileum. The duodenum is about the same length as the thickness of 12 fingers closed together, about 25 to 30 centimeters. Because the lumen receives acidic and alkaline chyme, pancreatic juice and bile pushed by the stomach, some people call the duodenum the "Yangtze River Delta" of the digestive tract. There is no obvious boundary between the jejunum and ileum, with the jejunum accounting for 2/5 and the ileum accounting for 3/5. The intestine is connected to the back of the colon, with a total length of 1.5 meters, and is divided into three parts: the cecum, sigmoid colon and duodenum.

Digestive glands are divided into two categories: one is located outside the digestive system; the large digestive glands visible to the human eye, such as the throat, liver and pancreas, all of which have tubes opening into the digestive system, and metabolic digestive enzymes can be injected into the digestive system through the tubes. The other is small glandular ducts distributed throughout the walls of the digestive system, which can only be seen under a microscope, such as gastric glands, intestinal glands, etc.

The energy needed by the body in various physiological activities and the raw materials needed by the body in development and tissue upgrading are all provided by food, and the nutrients contained in food must be digested and absorbed by the digestive tract before they can be used by the body. Food enters the mouth, is bitten by the teeth and stirred by the tongue, mixed with saliva, and flows into the stomach through the esophagus through the glossopharyngeal posture. It stays in the stomach for 3 to 5 hours, fully mixed with gastric acid, and basic digestion is carried out, and the chyme is sent to the colon through the movement of the stomach. After entering the colon, various nutrients in the food are digested and assimilated under the action of various pepsins. The remaining food residues enter the intestines and are finally excreted from the body.

2. Respiratory tract:

It is a general term for vocal organs, which are composed of two parts: the respiratory system and the lungs. The respiratory system is the safe passage for gas to enter and exit the lungs, and is composed of the nose, pharynx, larynx, bronchi and bronchitis. The lungs are the key organs of the respiratory tract and are the place for gas exchange. The body must constantly absorb oxygen from the outside and exhale carbon dioxide from the body. This whole process of gas exchange between the body and the outside is carried out by the respiratory tract. The respiratory tract and the respiratory system work together to carry out the whole process of breathing, while aerobic respiration and anaerobic respiration are carried out inside the body cells.

3. Urogenital system:

A system composed of a group of human organs that produce, transport, store, and metabolize urine. The human urogenital system includes the kidneys, urethra, bladder, and urethral opening. When the kidneys function, water and some substances in the blood (mainly metabolic substances) are filtered out through the renal tubules, then pass through the renal pelvis and are stored in the bladder through the urethra. When urinating, the bladder muscles contract and urine is discharged through the urethra.

(IV) Urinary system:

Anatomical name. It is a general term for the organs of the human body that reproduce offspring and continue the human race. The organs of the urinary system are different in males and females, but according to their functions, they are composed of the position of the prostate, reproductive tracts and attached organs. The male reproductive organs achieve the function of procreation through its various activities, fertilization, pregnancy and other physiological processes.