Here's the correct labels for your picture
A = Endothelial cell
B = Neutrophil
C = Internal elastic lamina
D = Tunica adventitia
E = Smooth muscle cell nucleus
Here's a useful diagram to understand the layers click image to enlarge
(E) is the smooth muscle layer dont forget that it is a longitudinal section in the blood vessel and the smooth muscles are circular so it will appear as D in additin smooth muscle cells are simple squamous epithelium and it couldnt appear like D so,
A is endothelim
B is neutrophil
C is basement membrane(and note that the arrow o C lies between two endothelial cells which are squamous in nature)
D is the advetitia
E is smooth muscle cells
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