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.
A SCAI answered. To understand how blood travels through the human body, we can begin in the heart. The heart is divided into four chambers: the upper chambers, called the left and right atria, and the lower chambers, which are called the left and right ventricles.