Which of the following is TRUE? The vessels included in a carotid Doppler scan include: CCA, ICA, and vertebral vessels but not the ECA. The carotid arteries provide a direct pathway for plaque and other particles to enter enter cerebral circulation. The right common carotid branches directly from the aortic arch. The extracranial carotid vessels are conduits for tissue drainage.

The statement "The carotid arteries provide a direct pathway for plaque and other particles to enter cerebral circulation" is TRUE.

The carotid arteries, which include the common carotid artery (CCA), internal carotid artery (ICA), and external carotid artery (ECA), are major blood vessels in the neck that supply blood to the brain, neck, and face. They are a direct pathway for blood (and potentially plaque and other particles) to enter the cerebral circulation.

The first statement is FALSE because a carotid Doppler scan does include the ECA.

The third statement is FALSE because the right common carotid artery branches from the brachiocephalic trunk, not directly from the aortic arch.

The fourth statement is FALSE because the extracranial carotid vessels are not conduits for tissue drainage; they are conduits for blood supply.