Final answer:
The blood vessels in the brain total nearly 100,000 miles, with the internal carotid arteries and vertebral arteries being critical for maintaining constant blood flow to this essential organ.
Step-by-step explanation:
The blood vessels present in the brain are almost 100,000 miles in length. The internal carotid arteries and the vertebral arteries are crucial for supplying blood to the human brain. Given the brain's necessity for a constant and uninterrupted blood supply, these arteries are essential for maintaining its proper function. When blood flow is interrupted, even briefly, it can result in serious consequences such as a transient ischemic attack (TIA) or a cerebrovascular accident (CVA), commonly known as a stroke. Therefore, the vast network of blood vessels in the brain ensures continuous blood flow, which is vital for our survival.