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.
Putin's shorter than he looks, Obama towers over Tony Abbott - while Canada's PM stands above the rest at the G20. 1  The G20 leaders will descend on Brisbane this weekend to flex their political muscles. 2  The tallest of them all is Canadian Prime Minister Stephen Harper, at 6ft 2in. He towers above the likes of South Africa's President Jacob Zuma, who is just 5ft 6in. According to a 2011 US study by Dr Gregg Murray, at Texas Tech University, voters see tall politicians as the best people for the top jobs.