Thermally insignificant vessels 300mm =0.002 146000mm are physically too short to allow blood to Aorta, thermally equilibrate with the surrounding Large arteries tissue;high flow V>line sources heat Small arteries transfer) Change in blood Ideal for mass transfer,because of temp.is Capillaries large surface area and slow flow rate negligible along =5500 blood is fully equilibrated with the surrounding tissue vessels at the entrance Collecting Venules -=55.6 1. Large veins =0.005 Physically too short, Vena Cava Line sinks(Heat Transfer 0.001= 5500 e l l = 55.6 e l l = 0.005 e l l Ideal for mass transfer, because of Ideal for mass transfer, because of Ideal for mass transfer, because of Ideal for mass transfer, because of large surface area and slow flow rate large surface area and slow flow rate large surface area and slow flow rate large surface area and slow flow rate Large veins Large veins Large veins Large veins = 0.001 e l l blood is fully equilibrated blood is fully equilibrated blood is fully equilibrated blood is fully equilibrated with the surrounding tissue with the surrounding tissue with the surrounding tissue with the surrounding tissue at the entrance at the entrance at the entrance at the entrance Physically too short, Physically too short, Physically too short, Physically too short, Line sinks( Heat Transfer Line sinks( Heat Transfer Line sinks( Heat Transfer Line sinks( Heat Transfer Vena Cava Vena Cava Vena Cava Vena Cava Collecting Collecting Collecting Collecting Venules Venules Venules Venules Capillaries Capillaries Capillaries Capillaries are physically too short to allow blood to are physically too short to allow blood to are physically too short to allow blood to are physically too short to allow blood to thermally equilibrate with the surrounding thermally equilibrate with the surrounding thermally equilibrate with the surrounding thermally equilibrate with the surrounding tissue; high flow V tissue; high flow V tissue; high flow V tissue; high flow V� line sources heat line sources heat line sources heat line sources heat transfer) transfer) transfer) transfer) Change in blood in blood in blood in blood temp. is temp. is temp. is temp. is negligible negligible negligible negligible along vessels vessels vessels vessels Thermally insignificant vessels Thermally insignificant vessels Thermally insignificant vessels Thermally insignificant vessels Aorta, Large arteries Large arteries Large arteries Large arteries Small arteries Small arteries Small arteries Small arteries 0.002 146000 300 = = mm mm l l e