Cell Apoptosis
Cell apoptosis is the programmed death of cells, which is necessary for the maintenance of proper tissue function and homeostasis. It is an essential process in multicellular organisms, as it helps to control cell numbers and maintain the integrity of the tissue. Apoptosis is also necessary for embryonic development, immune system responses and defense against cancer. It occurs in response to stresses such as DNA damage, hormones, cytokines and hypoxia, and involves the activation of specific pathways within the cell. Apoptotic cells are typically identified by a decrease in cell size and cell membrane blebbing, alteration in cell shape and formation of membrane-bound vesicles. The biological significance of cell apoptosis lies in its ability to maintain tissue homeostasis. Proper functioning of the immune system, embryonic development and defense against cancer all depend upon this process. Apoptosis has been studied extensively in the last decade, and its various pathways are now understood in great detail. Knowledge of the molecular and cellular basis of apoptosis is being applied to the development of new therapeutic strategies to treat diseases, such as cancer and autoimmune disorders.
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