(B) The inner lining of blood vessels,heart,and lymphatics is composed of a single layer of thin,flattened cells called the $Endothelium$. This is a s

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(B) The inner lining of blood vessels,heart,and lymphatics is composed of a single layer of thin,flattened cells called the $Endothelium$. This is a specialized type of simple squamous epithelium that provides a smooth surface for blood flow and regulates the exchange of substances between blood and tissues.