 Dear students, in this topic we shall discuss the peripheral circulation. In the cardiovascular system there are two pathways of blood circulation. That is the pulmonary circuit which circulates the blood through lungs and the systemic or peripheral circuit in which blood is pumped from the left ventricle, flows through the body and returns to the right atrium. In the peripheral circuit the left ventricle pumps oxygenated blood into the aorta which is the largest artery in peripheral circulation. The arteries from the aorta form the arterial system that supplies blood to organs and major body regions. The arteries branch to form capillary beds in tissues where oxygen or carbon dioxide exchange The oxygenated blood returns through the venous system to the superior and inferior vena keve. These vena keve open into the right atrium of the heart. Dear students, the blood vessels carry blood during the circulation. These blood vessels are of three types, arteries, veins and capillaries. Artaries carry blood away from the heart to the organs and tissues while veins return the blood back to the heart. The capillaries which have thin walls formed of only a single layer of endothelial cells permit exchange of materials between the blood and tissues.