What is diapedisis and photophosphorylation?
Answers
Explanation:
Diapedesis is defined in immunology as the outward passage of cells through the intact vessel wall. The most prominent cells to traverse the endothelial cell lining of the vessel walls are blood leukocytes, but tumor cells also translocate via the blood circulation through diapedesis from the primary tumor sites to distant sites in the body. Diapedesis of leukocytes is a major event in the migration of leukocytes from the blood circulation to sites of inflammation or tissue injury and in the recirculation of lymphocytes from the blood to the lymphatic compartment. Diapedesis of leukocytes is often confused with the terms ‘leukocyte transmigration’ or ‘leukocyte extravasation’. These terms define the entire process of leukocyte migration from the blood circulation to the extravascular connective tissue, across the vessel wall endothelium. Diapedesis is regarded as the final event in the transmigration, i.e. the actual penetration of the vascular endothelium and the subendothelial matrix.