This action causes mucous to discharge from the nose and may run down the back of the throat in order to prevent these substances from causing infection or irritation. Runny nose may be triggered by other conditions such as allergies, a cold or the flu, infections or particular medicines.
The largest veins in the human body are the venae cavae. The superior vena cava carries blood from the arms and head to the right atrium of the heart. The inferior vena cava carries blood from the legs and abdomen to the heart.n the circulatory system, veins (from the Latin vena) are blood vessels that carry blood toward the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart.
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.