What is the parenchyma
What is the parenchyma
Parenchyma is the aggregate of cellularelements of an organ that performs a specific function. The organs containing such cells in large quantities (spleen, liver, pancreas, etc.) are often called parenchymatous. Parenchymal tissues are found in vascular plants, multicellular sponges, and animals.
Parenchyma in plantsParenchymal cells, as a rule, have roundedOutlines, however, are also elongated. In plants, water and mineral water move through the walls of such cells. In different parts of the plant, the parenchyma can be modified and acquire specialized properties. Such cells include epidermis - a thin integumentary tissue. It consists of one layer of cells and covers the whole body of the plant. The main function of the epidermis is to protect the plants from drying out and from penetrating into the pathogens. Assimilation parenchyma is a specialized tissue containing a large number of chloroplasts (chlorophylliferous cells of leaf, stem, bark). Its main function is the realization of photosynthetic processes. Parenchymal plant cells provide support for those organs in which they are located. This property is especially important for stems of herbaceous plants. Non-specialized parenchyma cells remain metabolically active, many processes that are important for the plant organism take place in them. Through a system of intercellular compartments filled with air, there is a gas exchange between the external environment and living cells. Parenchymal cells also serve as a storage facility for nutrients.
Parenchyma in the human bodyParenchyma plays an important role in the bodyrights. It is the main functional tissue of the parenchymal organs: liver, spleen, lungs, kidneys, pancreas and thyroid gland. It includes a connective tissue stroma and specialized cellular elements. Parenchyma can be formed by various types of tissue: epithelium (glands), hematopoietic tissue (spleen), nerve cells (nerve nodes). The lung parenchyma is part of the apparatus that performs external breathing. It consists of pulmonary acini. Pulmonary acinuses begin with an end bronchiola, which branches into respiratory bronchioles, alveolar courses, alveolar sacs, forming an alveolar tree. In the lung parenchyma, external breathing takes place, one of the elements of which is the diffuse exchange of gases. Parenchymal cells of the kidneys are a specific tissue that performs the basic function of this organ. The spleen belongs to the parenchymal organs. Her parenchyma is a collection of lymphoid cells. Another organ is the liver, it consists entirely of parenchymal tissue, which is composed of hepatocytes. The pancreatic pancreatic parenchyma is a different tissue, which represents numerous irregularly shaped segments and round-shaped cellular areas (islets of Langerhans). Parenchyma diseases include numerous benign and malignant neoplasms that have a different structure. Among them, cancer of the renal parenchyma is quite common, accounting for about 90% of all cases of tumors in this tissue.