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 wound stops bleeding due to the process of clot formation called coagulation. Coagulation is from the Latin coagulatus meaning to cause to curdle. Blood contains an enzyme called Protease 34 kD or thrombin for short. Thrombin is made in the liver. The only time thrombin seems to become active in the body is when there is an open wound. Blood is circulating tissue composed of a fluid portion (plasma) with suspended formed elements (platelets, red blood cells, and white blood cells). Arterial blood is the means by which oxygen and nutrients are transported to body tissues.