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Veins And Fine Art: During the time that heart surgery was being developed and perfected, there was also considerable progress in the correction of abnormalities of the arteries and veins. Various techniques were developed to treat varicose veins, and sometimes even the large veins leading to the heart—the inferior and superior venae cavae—were objects of surgical attention. Operations on the larger arteries, however, constituted a more dramatic chapter in the history of cardiovascular surgery. Aneurysms (bulging enlargements) of the aorta excited much interest, and efforts, sometimes successful, were made to prevent aneurysms from bursting.The capillai are in close contact with the alveoli, which only one cell thick. In fact, each alveolus is most completely surrounded by capillaries. Si the walls of the capillaries are also one cell th: the partition separating blood from air is c about one or two thousandths of a millime Thus, there is a free exchange of gases throi this fine membrane so that oxygen in alveolar can readily diffuse into the blood and the car dioxide in the capillarv blood can easily diff into the alveolar air. From the pulmonary ca laries the blood, now fully oxygenated, enters pulmonary venules, larger and larger veins, ; finally the major pulmonary veins which enter left atrium. From this chamber the blood emp into the left ventricle to be pumped again throu out the body.
Marbling is best used on heavy materials such as skirtings, floors, a surrounds. If you like the idea of ma then have a look at the patterns and in real pieces of marble until you fim one you would like to copy. Draw ou designs and ideas to work from befc start. Feathers can be used to apply veins and fine artist's brushes will h< soften the effect. |
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