Also see user session. In telecommunication, a session is a series of interactions between two communication end points that occur during the span of a single connection.
The path of blood through the heart begins with the right atrium receiving blood, which has circulated through most of the body. This blood is relatively low in oxygen because most of it has already been delivered to different organs and tissues.
Blood is initially pumped from the heart into the aorta, the body's biggest artery. It then travels up to the brain through smaller branching arteries. The first branch off of the aortic arch is the innominate artery (also called the brachiocephalic artery), which provides blood to the right side of the head and neck.