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 of Blood through the Pulmonary and Systemic Circuits. Humans have a closed circulatory system, meaning that blood is confined within the chambers of the heart and blood vessels. The blood is pumped by the muscular heart and continuously flows through arteries, arterioles, capillaries, venules, and veins. In humans, the right side of the heart pushes blood through the pulmonary circuit so that it can be oxygenated in the lungs. The left side of the heart pumps oxygenated blood to the entire body via the systemic circuit. Click on the buttons to review the pathway of blood flow in the pulmonary and systemic circuits.