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 posterior branch which receives blood from the posterior portion. Because the inferior vena cava is on the right half of the body, the left renal vein is generally the longer of the two. This is in contrast to the right side of the body, where these veins drain directly into the IVC. Often, each renal vein will have a branch that receives blood from the ureter.