Yes, endothelial cells divide. It is important that these cells divide to replace old/dead cells and to create new blood vessels.

ENDOTHELIAL

Endothelial and epethelilal cells are the two different cell types which sandwich together the tissue. On the blood side is the endothelial cells (endo, meaning inside), and on the outer side are the epethelial cells. For example the epethelial cell layer are the cells that coat the intetestine wall, and thus absorb nutrients and the the endothelial cells are the cells that face the blood,and release those nutrients into the blood.

Alveolar squamous cells and Capillary endothelial cells.

Endothelial cells also known as epithernal tissue.