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. Bones. The most important organ of the skeletal system is the bones. Human skeleton is made up of 206 bones that in coordination not only provides support and protection to the viscera (with the help of muscles attached to them) but also produces blood cells for the body from the bone-marrow.