Which statement describes the tunica adventitia?

The tunica adventitia, also known as the tunica externa, is the outermost layer of a blood vessel. This layer primarily consists of elastic and fibrous connective tissue, which provides structural support and strength to the vessel. Its robust composition helps to anchor the vessel to surrounding tissues, ensuring stability and maintaining proper alignment within the circulatory system. This protective layer also contains larger blood vessels, known as vasa vasorum, that supply nutrients to the walls of larger arteries and veins. The announcement of its primarily connective tissue nature distinguishes it from the other layers, which have different functional roles in regulating the vessel's diameter or facilitating gas exchange.