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.
Report Abuse. Saphenous Vein This is the longest vein in the body. It is found in the leg and runs from the foot to the groin. This vein is commonly used in Coronary Artery Bypass Graft operations (CABG), where it is grafted to replace an artery of the heart that has become blocked.Depending on your height, it varies.he great saphenous vein (v. saphena magna; internal or long saphenous vein), the longest vein in the body, begins in the medial marginal vein of the dorsum of the foot and ends in the femoral vein about 3 cm. below the inguinal ligament.