Which term refers to the obstructing of blood flow?

The term that refers to the obstructing of blood flow is "ischemia." Ischemia occurs when there is a reduction in blood supply to an organ or tissue, leading to a deficiency of oxygen and nutrients that can result in cellular damage or dysfunction. This condition can arise from various causes, including blood clots, arterial blockages, or constricted blood vessels.

In contrast, hemolysis involves the breakdown or destruction of red blood cells, which affects blood components but does not specifically denote the obstruction of blood flow. Dyscrasia is a general term used to describe an abnormal condition of the blood, often affecting its composition or function, rather than a physical obstruction in circulation. Cellulitis, on the other hand, is an infection of the skin and underlying tissues that may involve inflammation and swelling, but it does not accurately capture the concept of obstructing blood flow. Thus, ischemia specifically addresses the obstruction or reduction of blood flow to tissues, making it the correct term in this context.