The layer of a blood vessel that is in direct contact with the blood is the [dropdown 1] while the layer of the vessel that is made up of smooth muscle and elastic fibers is the [dropdown 2].
Dropdown 1 choices:
tunica albuginea
tunica externa
tunica interna
tunica media
tunica vasculosa
Dropdown 2 choices::
tunica albuginea
tunica externa
tunica interna
tunica media
tunica vasculosa