How do molecules diffuse out of an artery?

[sameeralord]

Hello guys,

This might be a stupid question but artery has an inner endothelium and muscle outside. So if molecules diffuse out from the endothelium do they diffuse out of the muscle cells as well. How is that done, do muscle cells have the same membrane proteins as endothelium? Thanks

 

[sameeralord]

Oh right I forgot about capillary which is just one endothelium. Sorry guys!