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.
Review the path of blood through the heart. low O2 blood enters right atrium from inferior and superior vena cava and coronary sinus ->. passes through tricuspid valve into right ventricle ->. passes through pulmonary valve into pulmonary trunk ->. flows through pulmonary arteries into lungs ->.