Phagocytosis is limited to several special cell types, such as Amoebae and some single-celled eukaryotes, which take up nutrients from the surrounding environment through phagocytosis.
Phagocytosis
Phagocytosis is limited to a few special cell types, such as
(phagocytosis)
The main cells involved and their efficacy:
Neutrophil
1) The largest number, active first to the injured and inflamed area
2) Enzymes that sterilize and decompose cells in the contained granules can quickly
Phagocytosis and
Swallowing (pinocytosis)
Also called cellular drinking (cellular drinking), a type of endocytosis. It is a non-selective continuous uptake process of droplets in the extracellular matrix. Swallowed substances are usually liquid or dissolved. The small vesicles formed were less than 150 nm in diameter. According to whether extracellular substances are adsorbed on the cell surface, the puffing effect can be divided into two types: fluid-phaseendocytosis and absorptionendocytosis.
During the phagocytosis of cells, if the liquid is swallowed, it is called swallowing effect, and the endocytosis formed by this effect is also through
Fusion with lysosomes hydrolyzes substances in the liquid. Phagocytosis is also a way for cells to obtain nutrients,
The cells encapsulate some nutrients into the endosome through endocytosis, and finally fuse with the lysosome. Under the action of the lysosomal enzyme,
Digested nutrients are digested into small molecules that can be used directly for anabolic use. Some single-celled organisms rely on phagocytosis
Role to get nutrition.
Phagocytosis also includes phagocytosis of senescent, programmed cell death cells. For example, red blood cells that account for 1/4 of the total number of adult cells can only
Survival for 120 days, so the human body must clear a large number of aging red blood cells every day, which is mainly accomplished by phagocytosis, that is, the digestion of lysosomal enzymes
to make.
They devour invading pathogens such as bacteria, viruses, parasites, and some necrotic tissue fragments. It is generally believed that white blood cells can aggregate to foreign bodies and swallow them, because white blood cells have chemotaxis. Leukocytes are induced to move there by chemical stimuli from bacterial bodies or dead cells. Tissue inflammation produces an active polypeptide, which is also one of the inducers of leukocyte migration.
