CVS Practice Test 2025 - Free CVS Practice Questions and Study Guide

The correct answer indicates that the right and left carotid arteries supply approximately 80% of the blood flow to the head and neck. This high percentage reflects the crucial role that the carotid arteries play in delivering oxygen-rich blood to vital organs, including the brain, face, and neck.

The carotid arteries bifurcate into the internal and external carotid arteries, with the internal carotid supplying blood to the brain and the external carotid supplying blood to the face and neck. Understanding this distribution is essential because the brain's function relies heavily on a consistent supply of oxygenated blood, and the carotid arteries are the primary pathways for this flow.

In assessing the remaining options, they do not account for the full extent of blood flow provided by the carotid arteries, which is significant enough to be recognized as about 80%. Given the importance of brain perfusion, the proportion of blood flow reaching the head and neck from these arteries underscores their vital anatomical and physiological significance.