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.
The vena cava (main vein) on the right side carries deoxygenated blood through the right atrium through the right ventricle up into the pulmonary artery, which carries the deoxygenated blood to the lungs to get oxygenated again.imple answer: Veins Complex answer: a series of blood vessels (excluding arteries) carries deoxygenated blood from the body to the heart. Where the blood is then passed throu â¦ gh an oxygenating process with the lungs.