The circulatory system comprises of the heart, the lungs and the  blood vessels. The main objective of the circulatory system is  transporting oxygenated (rich saturation of oxygen) blood around  the body. The de-oxygenated blood enters through the vena cava and  into the right atrium of the heart.
Vladimir Putin's Height. 5ft 6.5in (169 cm) The President of Russia. A newspaper once reported that there was criteria for the height of people in official photos with him, and that they shouldn't be taller. Shockingly, the newspaper said with a straight face Vladimir is believed to be between 5ft 2 and 5ft 5.
1 of 25. Russian President Vladimir Putin carries a hunting rifle on Aug. 15, 2007, in the Republic of Tuva. Putin has been no stranger to the former Soviet Union's limelight, having held top positions in the country for more than 25 years. Dmitry Astakhov/AFP/Getty Images. 2 of 25. Then-Russian Prime Minister Vladimir Putin swims the butterfly during his vacation outside the town of Kyzyl on Aug. 3, 2009, in southern Siberia.