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A single layer of flattened epithelial cells which lined the lumen of blood vessels is ______?

A single layer of flattened epithelial cells which lined the lumen of blood vessels is ______?

چپٹے اپکلا خلیات کی ایک تہہ جو خون کی نالیوں کے لیمن کو لائن کرتی ہے ______ ہے؟
Explanation
  • The endothelium is a single layer of flattened epithelial cells that lines the inner lumen of blood vessels.
  • It plays a crucial role in regulating vascular functions, including blood flow and exchange of substances.