Which capillary type has pores in the endothelium?

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Multiple Choice

Which capillary type has pores in the endothelium?

Endothelial permeability in capillaries is dictated by pores in the lining. Capillaries with these pores, called fenestrae, are fenestrated capillaries, which allow greater exchange of small solutes between blood and tissues. This feature suits tissues that need rapid transport, such as the kidney, intestinal mucosa, and endocrine glands. Continuous capillaries lack pores and have tight junctions, limiting exchange and are typical in muscle and brain tissue. Sinusoidal capillaries have large gaps and an incomplete basement membrane, making them highly permeable to larger molecules and even cells, as seen in liver and bone marrow. Arterioles are not capillaries at all, so they don’t have endothelial pores of this type.

Endothelial permeability in capillaries is dictated by pores in the lining. Capillaries with these pores, called fenestrae, are fenestrated capillaries, which allow greater exchange of small solutes between blood and tissues. This feature suits tissues that need rapid transport, such as the kidney, intestinal mucosa, and endocrine glands. Continuous capillaries lack pores and have tight junctions, limiting exchange and are typical in muscle and brain tissue. Sinusoidal capillaries have large gaps and an incomplete basement membrane, making them highly permeable to larger molecules and even cells, as seen in liver and bone marrow. Arterioles are not capillaries at all, so they don’t have endothelial pores of this type.

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