<Li> The largest artery is the aorta and the largest vein is the inferior vena cava . </Li> <Li> The largest internal organ is the liver . It is also the heaviest organ, with an average of 1.6 kilograms (3.5 pounds). </Li> <Li> The largest external organ, which is also the largest organ in general, is the skin . </Li> <Li> The longest muscle is the sartorius muscle in the thigh . </Li>

The largest organ in the human body is the