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.
Anatomy and physiology â what is the carotid artery and what does it do? The common carotid artery carries blood from the heart to the brain. The main blood vessel exiting the heart is called the aorta. The common carotid artery is a branch off of the aorta and travels up the neck. Halfway up the neck, the common carotid branches into the internal and external carotid arteries. The internal carotid artery is the branch that eventually supplies the brain with oxygen-filled blood. There is a left and right carotid artery.