Question

What capillaries have endothelial cells pierced by filtration pores that allow the rapid passage of small molecules?

Answer 1

The answer here is “fenestrated”. Fenestrated capillaries have pores in the endothelial cells that are covered with a diaphragm of radially oriented fibrils and permit little amount of molecules and partial amounts of protein to diffuse. They are 60 to 80 nanometers in diameter.