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Structure and Function of Blood Vessels.
Member rating: No Rating | Words: | Submitted: Tue Mar 02 2004
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STRUCTURE AND FUNCTION OF BLOOD VESSELS INTRODUCTION The main transport systems are the circulatory systems, in which substances are dissolved or suspended in liquid and carried from one part of the body to another in a system of tubes called vessels. There are two main circulatory systems: The blood circulatory system (sometimes called the cardiovascular system) and the lymphatic system. The blood circulatory system is the main method of transporting oxygen, carbon dioxide, nutrients and metabolic breakdown products, cells of the immune and other defence systems, chemical messengers (hormones), other important substances (e.g. clotting factors). The lymphatic system drains extra-cellular fluid from the tissues returning it to the blood circulatory system after passage through lymph nodes. This system is also involved in absorption of nutrients from the gut. THE BLOOD CIRCULATORY SYSTEM There are three types of blood circulatory system, two of which (systemic circulation and pulmonary circulation) depend on...
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