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Erythrocyte deformability refers to the ability of erythrocytes (red blood cells, RBC) to change shape under a given level of applied stress, without hemolysing (rupturing).rythrocyte deformability is an important determinant of blood viscosity, hence blood flow resistance in the vascular system. It affects blood flow in large blood vessels, due to the increased frictional resistance between fluid laminae under laminar flow conditions.
Ductility, Capacity of a material to deform permanently (e.g., stretch, bend, or spread) in response to stress. Most common steels, for example, are quite ductile and hence can accommodate local stress concentrations. Brittle materials, such as glass, cannot accommodate concentrations of stress because they lack ductility, and therefore fracture easily. When a material specimen is stressed, it deforms elastically (see elasticity) at first; above a certain deformation, called the elastic limit, deformation becomes permanent.