If you are planning a hard-to-get Alcatraz tour, you will need to really layer clothes for a variety of temperatures. The weather varies greatly from month to month and hour to hour. Even the neighborhood youre in makes a difference. For many visitors, the San Francisco weather can be counter-intuitive.
The carotid arteries are major blood vessels in the neck that supply blood to the brain, neck, and face. There are two carotid arteries, one on the right and one on the left. In the neck, each carotid artery branches into two divisions: 1  The internal carotid artery supplies blood to the brain.
Carotid artery occlusion is a narrow, partially obstructed area in one or both of the carotid arteries of the neck that prevents crucial blood flow to the brain. If blood flow to the brain continues to be blocked, transient ischemic attacks (TIAs), stroke, brain damage, and death can occur. Incidence and Prevalence: Symptomatic carotid artery occlusion causes an estimate of 61,000 strokes in the US annually (Grubb).