What are caveoli?

Answer 1

caveoli are deep invaginations of the sarcolemma, which is the plasma membrane of smooth muscle cells!!

Answer 2

Caveoli are small invaginations or pockets in the plasma membrane of cells. They play a role in endocytosis, a process by which cells take in molecules (such as nutrients) from the external environment. Caveoli are particularly abundant in endothelial cells, where they contribute to regulating the transport of molecules across the cell membrane.