What documents do I need to present to reenter the United States? If seeking to enter the United States after temporary travel abroad, you will need to present a valid, unexpired âgreen cardâ (Form I-551, Permanent Resident Card).
Brain Tour. 2. Supply lines. Your brain is nourished by one of your body's richest networks of blood vessels. With each heartbeat, arteries carry about 20 to 25 percent of your blood to your brain, where billions of cells use about 20 percent of the oxygen and fuel your blood carries. When you are thinking hard, your brain may use up to 50 percent of the fuel and oxygen.
Name and describe the main types of blood vessels in the body. Types of blood vessels Once blood leaves the heart, it is transported around the body in three main types of blood vessels:Arteries ,Veins ,Capillaries Arteries: Arteries transport the oxygenated blood away from the left side of the heart.he Superior Vena Cava carries blood to the heart from the upper body, while the Inferior Vena Cava carries blood from the lower body. Another unique feature of veins is that they have valves. Like the valves in the heart, they are there to prevent a backflow of blood.