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.
There are three types of veins in the legs: 1  Superficial veins, which are the ones just below the skin surface. You can often see or feel the larger superficial veins. The superficial leg veins are the ones that may develop into varicose veins. 2  Deep leg veins, which pass through the muscles. You cannot see or feel these.