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2) "Capillaries" -- As to broken capillaries 2capillary
Function: noun
Inflected Form(s): plural -lar·ies
: a capillary tube; especially : any of the smallest blood vessels connecting arterioles with venules and forming networks throughout the body Pronunciation Symbols
Blood flows from the heart to arteries, which narrow into arterioles, and then narrow further still into capillaries. After the tissue has been perfused, capillaries widen to become venules and then widen more to become veins, which return blood to the heart. Capillaries are the smallest of a body's blood vessels, measuring 5-10 μm. They connect arterioles and venules, and they are the blood vessels that most closely interact with tissues. - 1 Structure
- 2 Transport across endothelium
- 3 Immune response
- 4 Capillary bed
- 5 Types
- 6 See Also
- 7 References
- 8 External links
| The walls of capillaries are composed of only a single layer of cells, the endothelium. This layer is so thin that molecules such as oxygen, water and lipids can pass through them by diffusion and enter the tissues. Waste products such as carbon dioxide and urea can diffuse back into the blood to be carried away for removal from the body. Capillary permeability can be increased by the release of certain cytokines. The endothelium also actively transports nutrients, messengers and other substances. Large molecules may be too big to diffuse across endothelial cells. In some cases, vesicles contained in the capillary membrane use endocytosis and exocytosis to transport material between blood and the tissues.g In an immune response, the endothelial cells of the capillary will upregulate receptor molecules, thus "catching" immune cells as they pass by the site of infection and aiding extravasation of these cells into the tissue. The "capillary bed" is the network of capillaries supplying an organ. The more metabolical..."
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