Basic Structure Of The Cardiovascular System And The Circulatory System

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CIRCULATORY SYSTEM 1. INTRODUCTION The circulatory system is also known as the cardiovascular system. This system is a double circulatory closed system which transports blood via arteries, veins and capillaries to the lungs through the pulmonary circulation and to the rest of the body tissues in the systemic circulation. Since the blood travels to varying distances around the body, the blood vessels have to be adapted to overcome different pressures. The pressure changes in the four chambers on the heart (two atria’s and two ventricles) allow the blood to continuously flow in one direction. This is also aided by the valves (artioventricular and semi lunar valves). The circulatory system consists of the heart as well. The heart is a complex organ positioned in the mediastinum which is in the medial cavity of the thorax. It lies anterior to the vertebral column and posterior to the sternum. 2. BASIC STRUCTURE OF ARTERY AND VEIN Blood vessels are channels which help blood to be distributed to the rest of the body. The vessels make up two systems which are closed that begins and ends at the heart. However, based on the structure and function, the vessels are put into categories such as arteries and veins. ARTERY These are vessels carrying blood away from the heart. These carry oxygenated blood from the heart to the rest of the blood tissues. However, there is one artery which does not carry oxygenated blood, and that the pulmonary artery. The pulmonary artery carries

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