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.
SUPERFICIAL VEINS OF LOWER LIMB (N512, N513) 1  Great Saphenous Vein On the anterior thigh, it travels through the Fossa Ovalis, after which it merges with the Femoral Vein. As you go down the leg, it wraps medially around to the posterior aspect of the knee. 2  Lesser Saphenous Vein: Runs up the posterior leg.