What is a Body Cavity?
The body cavity is the space around the internal organs of an animal. From the perspective of embryonic development, the real body cavity is the cavity formed between the mesoderm and the body wall after separation. This true body cavity began to appear since the link animal. The human body cavity is divided by the diaphragm into upper and lower parts. The upper part is called the chest cavity, which contains organs such as the heart and lungs. The lower part is called the abdominal cavity, which contains the stomach, intestines, liver, gallbladder, spleen, and kidneys.
- Chinese name
- Body cavity
- Foreign name
- coelom
- Object
- Internal organs
- Device officer
- Stomach, intestine, liver, gallbladder, spleen and kidney, etc.
- Examples
- Link animal
- The body cavity is the space around the internal organs of an animal. From the perspective of embryonic development, the real body cavity is the cavity formed between the mesoderm and the body wall after separation. This true body cavity began to appear since the link animal. The human body cavity is divided by the diaphragm into upper and lower parts. The upper part is called the chest cavity, which contains organs such as the heart and lungs. The lower part is called the abdominal cavity, which contains the stomach, intestines, liver, gallbladder, spleen, and kidneys.
- The space around each internal organ in an animal's body is called the body cavity. Body cavities are divided into two types: true cavity and prosthetic cavity. Prosthetic cavities exist in the nematode phylum, linear animal phylums, etc., which are the cavity surrounded by mesoderm and endoderm, which are relatively low. Real prosthetic cavities are widely found in all the higher-level animals such as link animals, molluscs, chordates, See the next paragraph for details.
- Strictly speaking, the true body cavity is during the development of an animal embryo. The visceral wall and body wall are separated from the mesoderm of the animal, and the cavity formed between the visceral wall and the body wall is the body cavity. Invertebrates have real body cavities starting from link animals such as earthworms. The appearance of a real body cavity has a muscle layer on the intestinal wall and enhanced digestive ability. Among vertebrates, lower vertebrates such as fish have only one body cavity, while higher vertebrates are divided into the chest cavity and abdominal cavity.
- Biological significance of the body cavity:
- Improved the body's flexibility, expanded the space to accommodate internal organs, allowed more cells to be on the surface, increased its chance of obtaining material exchange, and made animals have greater volume and complexity; fluid-filled body cavities in some animals It plays the role of hydrostatic skeleton and improves the animal's motor function. In addition, the formation of true body cavity is closely related to the circulation, excretion, and reproductive systems.