Knowra Necrosis Necrosis Necrosis is irreversible cell or tissue death in a living organism, commonly caused by injury, infection, toxins, or loss of blood supply. It often provokes inflammation in surrounding tissue.
Cell injury : Cell injury is structural or functional damage that disrupts a cell’s normal state. Necrosis is an irreversible outcome of severe cell injury.
Ischemia : Ischemia is inadequate blood flow to a tissue, limiting oxygen and nutrient delivery. It is a frequent cause of necrosis, especially in the heart and limbs.
Infarction : An infarction is an area of tissue death caused by interrupted blood supply. Most infarcts involve necrosis, making this a central clinical consequence of ischemia.
Autolysis : Autolysis is the breakdown of cells by their own enzymes, often after death or tissue removal. It can resemble necrosis microscopically but occurs without the same living-tissue response.
Apoptosis : Apoptosis is regulated cell death that dismantles cells while usually limiting inflammation. It contrasts with necrosis, which commonly disrupts cells and inflames nearby tissue.
Hypoxia : Hypoxia is an insufficient supply of oxygen to tissues or cells. Prolonged oxygen shortage can deplete cellular energy and lead to necrosis.
Myocardial infarction : A myocardial infarction is death of heart muscle caused by prolonged interruption of coronary blood flow. It is a common, high-stakes example of ischemic necrosis.
Pyroptosis : Pyroptosis is inflammatory programmed cell death triggered by immune signaling, often during infection. Like necrosis, it releases cellular contents, but it follows a regulated immune pathway.
Coagulative necrosis : Coagulative necrosis preserves tissue architecture temporarily after cells die, often following ischemia. This is the characteristic pattern of necrosis in many infarcts outside the brain.
Adenosine triphosphate : Adenosine triphosphate is the principal energy-carrying molecule used by cells. Severe energy depletion disrupts membrane pumps and contributes to irreversible cell injury.
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