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 DEFINITION
The vascular system is the circuit across which the blood travels round the organism.
It consists basically of two circuits:
The short or right circuit (pulmonary circulation) starts in the right part of the heart; it takes blood to the lungs, and returns again blood become oxygenated to the heart. The long or left circuit (systemic circulation) starts in the left part of the heart; it receives the become oxygenated blood of the lungs, and sends it to the whole rest of the organism.
The blood sends to itself across the artery aorta (the biggest of the organism) to a system of smaller and smaller arteries, up to the arteriolas first and despúes for the capillary system, up to all the textiles. In the capillary system, the blood gathers carbon dioxide and other products of undone from the textiles, and his comeback trip starts by the venous system, starting by the vénulas and later for veins bigger and bigger that come together in the veins you dig (the biggest veins of the organism), up to the right heart.
The blood quantity of the circulatory system is constant (about 7 % of the corporal weight), but the distribution of the blood in a few or other glasses changes extensively in accordance with the exercise, the exhibition to cold or to heat, the emotions, etc. During the exercise, blood goes more to the muscles. After eating, blood goes more to the intestines. If it is very hot, blood goes more to the skin, what helps to remove the heat. If it is cold, the blood flow is redistributed to the most internal glasses, in an attempt of preserving the heat.
This so flexible system is exposed to many anomalies. Some of them for problems of heart; also for illnesses that they affect straight to the glasses, especially the arteriosclerosis, which can owe to other general illnesses like the diabetes, or to be a result of a set of harmful habits in the diet and the daily activity.
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DEFINITION 
