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.
What are varicose veins? Varicose veins are veins that are swollen and bulge above the surface of the skin. They may be twisted and are often blue or dark purple. Varicose veins are most commonly found on the legs or feet, but they can also be found on the groin. Varicose veins that you see are just under the surface of the skin.