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Differences in vascular permeability between normal tissue and a tumor. Vascular permeability, often in the form of capillary permeability or microvascular permeability, characterizes the capacity of a blood vessel wall to allow for the flow of small molecules (drugs, nutrients, water, ions) or even whole cells (lymphocytes on their way to the site of inflammation) in and out of the vessel.
Anaphylactic shock is caused by a severe anaphylactic reaction to an allergen, antigen, drug, or foreign protein causing the release of histamine which causes widespread vasodilation, leading to hypotension and increased capillary permeability. Signs of anaphylaxis Signs typically occur after exposure to an allergen and may include:
The decrease in surface tension increases the wettability of the capillary walls, making it easier for the fluid to flow through the capillary. Heat also effects the viscosity of a fluid inside a capillary. An increase in heat decreases the viscosity of the lumenal fluid. A good example of this action can be observed in the human body during ...
The excessive extracellular fluid (interstitial fluid) in edemas is to a substantial degree caused by an increased permeability of the smallest blood vessels (capillaries). This permeability is modulated by numerous biochemical chain reactions and can therefore be unbalanced by many influences. [29]
Septic shock is a result of a systemic response to infection or multiple infectious causes. The precipitating infections that may lead to septic shock if severe enough include but are not limited to appendicitis, pneumonia, bacteremia, diverticulitis, pyelonephritis, meningitis, pancreatitis, necrotizing fasciitis, MRSA and mesenteric ischemia.
Overexpression of VEGF causes increased permeability in blood vessels in addition to stimulating angiogenesis. In wet macular degeneration , VEGF causes proliferation of capillaries into the retina. Since the increase in angiogenesis also causes edema , blood and other retinal fluids leak into the retina , causing loss of vision.
In septic shock the blood flow in the microvasculature is abnormal with some capillaries underperfused and others with normal to high blood flow. [5] The endothelial cells lining the blood vessels become less responsive to vasoconstrictive agents, lose their glycocalyx (normal coating) and negative ionic charge, become leaky and cause extensive ...
Bradykinin (BK) (from Greek brady-'slow' + -kinin, kīn(eîn) 'to move') is a peptide that promotes inflammation.It causes arterioles to dilate (enlarge) via the release of prostacyclin, nitric oxide, and endothelium-derived hyperpolarizing factor and makes veins constrict, via prostaglandin F2, thereby leading to leakage into capillary beds, due to the increased pressure in the capillaries.