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.
The blood is a transport medium for the movement of nutrients into and wastes out of tissues. Blood flows through 2 distinct circuits; the pulmonary circuit and the systemic circuit. In the Pulmonary Circuit, blood that is high in carbon dioxide and low in oxygen flows from the right heart to the lungs.