Which type of capillary has a complete endothelial lining and no pores?

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This tests the structural basis of capillary permeability. A capillary with a complete endothelial lining and no pores is a continuous capillary. Here, the endothelial cells form an uninterrupted tube joined by tight junctions, so there are no fenestrae or gaps. That arrangement keeps permeability relatively selective, mainly allowing small solutes and water to pass and using vesicular transport for larger molecules. Continuous capillaries are common in many tissues (like muscle and connective tissue), while fenestrated capillaries have pores that enable higher exchange, and sinusoidal capillaries have large gaps and a discontinuous basement membrane for even greater permeability. Venous capillaries aren’t a distinct capillary type; they’re part of the venous side of the microcirculation and are more permeable than the continuous type.