Question

label: vein
question 11
the layer in the wall of an artery that is smooth to prevent abnormal clotting is the:
o simple squamous epithelial lining
o middle layer of smooth muscle and elastic connective tissue
o outer layer of fibrous connective tissue
o smooth muscle lining

Explanation:

The innermost layer of an artery is the tunica intima, which is composed of a simple squamous epithelial lining (endothelium). This smooth surface reduces friction and prevents abnormal blood - clotting. The middle layer (tunica media) is for regulation of vessel diameter, and the outer layer (tunica adventitia) provides structural support. There is no smooth muscle lining in the context of preventing clotting in the way described in the question.

Answer:

simple squamous epithelial lining