What groups of cells are called tissues? The structure of the tissue cell

What groups of cells are called tissues? To understand this question, it is necessary to recall the peculiarities of their structure and functioning. With this we will try to cope in our article.

What groups of cells are called tissues

A tissue is considered to be a group of cells. But not all of them are able to form such structures. To understand what groups of cells are called tissues, it is necessary to master the main condition. It consists in the fact that all cells should have similar features of the structure, and therefore, and perform the same functions. Only then can such structure be considered a fabric. In addition, many of them contain in various quantities an intercellular substance that unites all the components into a single whole.

The structure of the tissue cell

All cells of the body have a general plan of structure. They consist of a surface apparatus, cytoplasm, organelles and inclusions. But depending on the type of tissue cells have their own characteristics. For example, neurons consist of a body and processes. Such a structure provides a single work of the whole organism and its connection with the environment. On the processes, the information, encrypted as a nerve impulse, is transmitted to cells and tissues.

The difference between multicellular and colonial organisms

Not all organisms, consisting of a largenumber of cells, have tissues. A vivid example of this is algae. Indeed, their body is formed by a multitude of cells, but each of them works separately, as a separate system. They are connected only anatomically, because their shells are adjacent to each other. The body of the algae is called the thallus or thallus. But the Volvo is a colony. It is also formed by a large number of isolated cells. But they are not adjacent to each other, but are surrounded by a common shell. It also binds them to a single organism. In multicellular organisms, cells are grouped into groups according to their structural features, which enable them to perform certain functions collectively.

Fabrics of plants

Each group of organisms has its own characteristicsstructure. Cells, tissues and plant organs, for example, are capable of carrying out a complex process of nutrition - photosynthesis. This is due to the presence of specialized organelles, which are called chloroplasts. But this is not the only characteristic feature of these organisms.

Plant tissues are represented by five species. This coverslip, basic, mechanical, conductive and educational. The first of them protects internal contents from dangerous environmental influences and carries out a metabolism. Therefore, a cover tissue consists of tightly fitting small cells that have pores. It can be alive - peel, and dead, lignified - cork. The basic fabric fully justifies its name, since it really makes up the whole body. Her cells are large, loose. They contain chlorophyll.

The mechanical tissue allows the organs of plantsoccupy a certain position in space. At one time, this became one of the conditions for the emergence of plants on land. Elements of conducting tissues are vessels and sieve tubes. These hollow cells of elongated shape provide an ascending and descending current of substances in the plant. The cells of the educational tissue are alive and constantly divide, forming elements of all other types of tissues.

Animal Fabrics

The animal organism has other kinds of cells. The tissues of these organisms are epithelial, connective, muscular and nervous. In the structure of each of them, there is a clear relationship between its structure and functions. The cells of the epithelial tissue are small, tightly fitting, similar to the shield. Therefore, they provide reliable protection. Examples of connective are blood, fatty, bone and cartilaginous tissues. Since they form the basis of the body, their elements are large and are in large quantities of intercellular substance. Muscular movement of the body in space. Its cells are called myofibrils. Each of them is capable of reduction. Nervous tissue provides the body's connection with the environment, as it is formed by cells with processes that form a dense network.

So which groups of cells are called tissues? The answer is simple: only those that are similar in structure and function. Due to its mnogobraziyu, cells of all organisms are able to form several types of tissues, each is important for functioning.