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.
The skin is the major organ of the integumentary system. Other parts of the integumentary system in humans include the hair and nails. Integument system is the largest organ of the body. It is derived from Ectoderm of the embryo.