1. a thin layer of flat cells that lines the inside of blood vessels and the heart
Usage: anatomy; medical

Examples

• The endothelium plays a crucial role in regulating blood flow and preventing clot formation.
• Damage to the endothelium can increase the risk of cardiovascular disease.
• The endothelium is only one cell thick, allowing for efficient exchange of nutrients and gases.
• High blood pressure can harm the endothelium over time.
• Scientists study the endothelium to understand how atherosclerosis develops.
• The endothelium produces substances that help relax blood vessel walls.