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 longest nerve in the human body is the sciatic nerve which arises as one of the 2 terminals from the sacral plexus. it has a blood supply from the inferior gluteal artery by a small branch that passes inside the nerve, so cutting the nerve will result in severe bleeding. its branches are.