MEDICAL PHYSIOLOGY

Detailed explanation-1: -Endothelial cells form a single cell layer that lines all blood vessels and regulates exchanges between the bloodstream and the surrounding tissues. Signals from endothelial cells organize the growth and development of connective tissue cells that form the surrounding layers of the blood-vessel wall.

Detailed explanation-2: -The endothelium of blood vessels is made up of simple squamous epithelium. The oesophagus and the lining of the mouth are covered with squamous epithelium. The skin which protects the body is also made of squamous epithelium.