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.
Pathway. Blood that starts off in the right ventricle of the heart is pumped up into the pulmonary arteries and into the lung tissue. Once the exchange of gases has occurred between the capillaries and the alveoli, the blood runs into the pulmonary arteries and back into the left atrium of the heart.