The main signs of the structure of the body of animals

In animals, in the process of evolution, organs were formed that make up organ systems:

1. Integumentary system – separates the body from the environment, protects against possible negative influences, regulates body temperature.

2. The musculoskeletal system – provides movement and location of the body in space. May protect internal organs from damage.

3. Respiratory system – provides the body’s gas exchange, that is, the removal of carbon dioxide and oxygen supply.

4. Digestive system – provides preparation of consumed food for its assimilation by the body, breaking down complex substances to simpler ones.

5. Circulatory system – carries out the movement of blood through the body, thus saturating its cells with oxygen and nutrients.

6. Excretory system – removes harmful metabolic products from the body.

7. Nervous system – analyzes information from the environment and its internal organs, provides a response to this information.

8. The sensory system – the system of the senses – perceives information from the environment.

9. The reproductive system – ensures the reproduction of organisms.

Each organ in the system has a characteristic structure and performs its functions.
An organ is a constituent part of the body that occupies a certain position, has a certain structure and performs a certain function.
Animals have a clear body symmetry. If the body can be divided into at least 2 mirror parts, then it is symmetrical.
Radial (radial) symmetry is a symmetry that allows you to draw several planes through the body of an animal, dividing it into equal parts by each plane.
Bilateral (bilateral symmetry) is a symmetry that allows one plane to be drawn through the body of an animal, which divides it into 2 equal halves.

The presence of a body cavity is characteristic of animals.
Body cavity – the space located between the walls of the body and internal organs. Allocate body cavities:
1. Intestinal – a cavity delimited by the wall of the body from the environment.
2. Primary – filled with cavity fluid, which freely washes the internal organs.
3. Secondary – a cavity in which organs are separated from the walls of the body by a layer of cells.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.