The West is blinking in disbelief â Vladimir Putin just invaded Ukraine. German diplomats, French Eurocrats and American pundits are all stunned.
The  circulatory system is the body's transport system. It is made up of a group of organs that transport blood throughout the body. The heart pumps the blood and the arteries and veins transport it. Oxygen-rich blood leaves the left side of the heart and enters the biggest artery, called the aorta.
1 The largest internal organ is the liver. 2  It is also the heaviest organ, with an average of 1.6 kilograms (3.5 pounds). 3  The largest external organ, which is also the largest organ in general, is the skin. 4  The longest muscle is the sartorius muscle in the thigh. The longest bone in the human body is the femur. 2  The largest artery is the aorta and the largest vein is the inferior vena cava. 3  The largest internal organ is the liver. 4  It is also the heaviest organ, with an average of 1.6 kilograms (3.5 pounds).