NEET BIOLOGY

Detailed explanation-1: -phagocytosis, process by which certain living cells called phagocytes ingest or engulf other cells or particles. The phagocyte may be a free-living one-celled organism, such as an amoeba, or one of the body cells, such as a white blood cell.

Detailed explanation-2: -Phagocytosis is a type of endocytosis. Endocytosis is a process through which a cell absorbs a particle, molecule, bacterium, or other types of matter by engulfing it. Often a phagocyte like the macrophages or a protist, engulfs a solid particle to form an internal compartment known as a phagosome.

Detailed explanation-3: -Phagocytosis is an important process for nutrition in unicellular organisms, while in multicellular organisms it is found in specialized cells called phagocytes. Phagocytosis consists in recognition and ingestion of particles larger than 0.5 m into a plasma membrane derived vesicle, known as phagosome.

Detailed explanation-4: -In addition to their role in innate immunity by elimination of pathogens, cell debris and apoptotic cells, phagocytes also participate in the adaptive-immune response by presenting antigens to lymphocytes. Phagocytosis is an important event in antigen presentation.