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.
These are the extrinsic route and the intrinsic route. The difference is what sets off the pathway when damage to a blood vessel occurs. 'Extrinsic' means 'outside' and 'intrinsic' means 'inside'. These words refer to WHERE the two pathways begin that lead to the formation of fibrin.The extrinsic route begins OUTSIDE the blood vessel. It is set in motion when blood leaves a broken blood vessel and enters the surrounding tissues.s you probably know, blood clotting involves a complex series of chemical reactions which ultimately result in the formation of a sticky protein called fibrin, which sticks to damaged blood vessels and helps to stop bleeding by forming a blood clot.