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Fenestrated capillaries

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Fenestrated capillaries are capillaries that have small openings or windows called fenestrae. These openings or pores allow molecules and particles to move in and out of the capillaries.

There are three types of capillaries: continuous capillaries, fenestrated capillaries and discontinuous capillaries. Capillaries are thin walled vessels that are composed of a single layer of squamous epithelium. They also have a basement membrane called a tunica intima and connective tissue cells called pericytes.

Fenestrated capillaries serve in filtration and transport. They have thin nonmembranous diaphragms across their openings that are formed by radially oriented fibrils. They are mostly found in the endocrine glands and also form the capillary bed in the mucosa of sites where fluids and metabolites are absorbed. This includes sites such as the gallbladder, kidney and small intestines. In the kidney they form the glomerulus, the main filtering unit of the kidney.

Terminology English: Fenestrated capillary
Location Endocrine glands and sites of fluid absorption
Function Transportation and filtration of molecules and particles

Learn more about the fenestrated capillaries and other capillaries in this study unit: 

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