Answer :
The most permeable capillaries, which contain fenestrations and large intercellular clefts, are called Sinusoid capillaries.
Venules and arterioles are connected by capillaries. They enable the fluid between the blood and tissue cells as well as the exchange of nutrients and wastes. This exchange takes place by pinocytosis, which means "cell drinking," and passive diffusion. For proteins and certain lipids, pinocytosis is employed. White blood cells can also enter the surrounding tissue through intercellular connections to heal damage and fight infections. Cancerous cells that are spreading employ this channel as well.
Due to the enormous intercellular clefts between their endothelial cells, sinusoid capillaries are the most permeable type of capillary. These capillaries enable the passage of big molecules, including blood cells, into the tissue around them. The liver, bone marrow, spleen, and adrenal medulla all contain sinusoid capillaries.
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