According to the strength of regeneration, human cells can be divided into three categories:
Labile cells are a large class of cells with strong regenerative capacity. Under physiological conditions, such cells are periodically replaced just like metabolism. In the case of pathological damage, it often manifests as regenerative repair. There are epidermal cells, respiratory tract and digestive tract mucosal coated cells belonging to such cells.
Stable cells These cells have a strong potential for regenerative. Under physiological conditions, it is in the stationary phase (G0) of the cell cycle and does not proliferate. However, when it is damaged or stimulated, it enters the pre-synthesis stage (G1), begins to divide and proliferate, and participates in regeneration and repair.
The cells belonging to such cells are various parenchyma of glands and adenoid organs, such as mucosal glands such as digestive tract, urinary tract and reproductive tract, liver, pancreas, parotid gland, endocrine gland, sweat gland, sebaceous gland parenchyma cells and renal tubules. Epithelial cells, etc.
Permanent cells are cells that do not have the ability to regenerate. These cells leave the cell cycle after birth and permanently stop mitosis. There are nerve cells (including central neurons and peripheral ganglion cells), and the regeneration ability of cardiomyocytes and skeletal muscle cells is also very weak. There is no practical significance of regenerative repair. Once damage is destroyed, it is permanently missing. Repair with scars.
