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•BY: GRYFFYNDOR : ANNIE, NAYELI, JULIAN, DEIGO, AND KATHRYN! The circulatory system moves Blood through the body The circulatory system includes The heart, blood, and blood vessels The 3 kind if blood vessels are Arteries, capillaries, and veins. Most arteries carry blood With lots of oxygen Unlike arteries and capillaries, veins Have valves. blood vessels Valves are flaps that act like doors to keep blood moving in only one direction. Veins have thinner walls than arteries but thicker walls than capillaries. Side by side , ten capillaries would barely as thick as one hair Some capillaries are so narrow that blood cells must flow through them in a single-file line. The capillary is the tiniest kind of blood vessel Oxygen and the nutrient move from the blood in the capillaries through your thin walls to your body cells. The capillaries have to join together to form the smallest veins. Veins are blood vessels because that transport blood to your heart A lot of tiny veins join many times to form larger veins. The Heart Diagram In mammals, the function of the right side of the heart (see right heart) is to collect de-oxygenated blood, in the right atrium, from the body (via superior and inferior vena cavae) and pump it, through the tricuspid valve, via the right ventricle, into the lungs (pulmonary circulation) so that carbon dioxide can be dropped off and oxygen picked up (gas exchange). This happens through the passive process of diffusion. The left side (see left heart) collects oxygenated blood from the lungs into the left atrium. From the left atrium the blood moves to the left ventricle, through the bicuspid valve, which pumps it out to the body (via the aorta). On both sides, the lower ventricles are thicker and stronger than the upper atria. The muscle wall surrounding the left ventricle is thicker than the wall surrounding the right ventricle due to the higher force needed to pump the blood through the systemic circulation. The right and left atria and the right ventricles are the four chambers of the heart. The veins from the lungs are colored blue because they contains blood with less oxygen-rich blood. The arteries going to the lungs are colored blue because they contain blood with less oxygen. Your heart was still pumping when you were born because your alive.