Bloody or tarry stools refer to a stool sample thatâs either dark red or black in color. Bloody or tarry stools can indicate bleeding or other injuries in your gastrointestinal tract. You may also have dark, discolored bowel movements after eating dark-colored foods.
The longest vein in the body is the great saphenous vein, a superficial vein found in the leg.he deep veins are essenti â¦ ally a column of blood running from your head to you feet and so when one is standing are under high pressure. In order to keep this pressure away from the frail superficial veins the penetrating veins have valves.
The Small Saphenous Vein (SSV) is the second main superficial vein in the leg (the main superficial vein in the leg being called the Great Saphenous Vein (GSV)). It is called a truncal vein as it is one of the long straight veins in the leg. The Great Saphenous Vein is the other truncal vein in the leg.he Small Saphenous Vein (SSV) is the second main superficial vein in the leg (the main superficial vein in the leg being called the Great Saphenous Vein (GSV)). It is called a truncal vein as it is one of the long straight veins in the leg. The Great Saphenous Vein is the other truncal vein in the leg.