1. The cardiovascular system is the

1. The cardiovascular system is the system of blood circulation. By the cardiovascular system we mean the heart, the arteries, the veins and the capillaries of the human body.

2. The centre of the circulatory system is the heart. The human heart is a cone-shaped organ, about 5 inches1 long and 3 1/2 inches broad. It weighs about 10 ounces2 in the adult male, 6 ounces in the female. It lies in the thoracic cavity, just behind the breastbone and between the lungs. The heart is a hollow muscle which has four chambers. The right heart consists of an upper chamber, the atrium or the auricle and a lower chamber, the ventricle. Between these two chambers is a one-way valve, the tricuspid valve. The left heart has two chambers, but the valve that separates its chambers we call the mitral valve. Although the heart is a unit, anatomically and functionally, we may think of it as of two pumps - the «right heart» and the «left heart». The right heart receives blood from the veins and pumps it into the lungs by way of the lesser circulatory system. In the lungs the blood receives oxygen. Then it moves into the left heart. From the left heart the well-oxygenated blood moves into a large artery, the aorta. The blood returns to the heart by means of the veins. The walls of the capillaries are so thin that the dissolved nourishment that has come from the digestive system and the oxygen that has come from the lungs can pass through them into the tissues of the body and so nourish it. The capillaries form a close network all over the body. They gradually join together and get larger, and become veins.



Left

pulmonary artery Pulmonary artery

Left atrium

Mitral valve Aortic valve Left ventricle Interventricular septum

Right ventricle

Fig. 3. Diagram of the heart

3. Blood vessels that receive blood from the ventricle and lead it away from the heart and towards other organs are arteries («air duct» - Greek). The vessels received this name because the early anatomists assumed that they had been empty in dead persons and had carried air.The artery that takes up the blood from the right ventricle and carries it to the lungs is the pulmonary artery («lungs» - Latin). The pulmonary artery divides in two - one branch leads to the right lung, the other - to the left. The arteries continue to divide and subdivide and form smaller and smaller vessels with thinner and thinner walls. The smallest arteries are the arterioles and these finally divide into capillaries («hairlike» - Latin). We name them so because of their fineness, though actually they are much finer than hairs.

4. Gradually the capillaries begin to join into larger vessels. Such larger blood vessels that carry blood to the heart from the organs are the veins. The smallest of these are the venules.

5. The particular vein into which the capillaries and venules of the lungs finally unite is the pulmonary vein. The pulmonary vein carries the freshly oxygenated blood to the left auricle. The pulmonary artery and pulmonary vein make up the pulmonary circulation.

6. The contraction of the left ventricle forces the blood through a one-way valve into the aorta («to lift up» - Greek). The aorta is the largest artery in the body. It moves upward at first (the ascending aorta), but then arches over dorsally (the arch of the aorta). In its downward course, the aorta passes through the diaphragm.

7. The blood is a red fluid, which coagulates when escapes from a blood vessel. It consists of a colourless fluid, plasma or serum, and many millions of minute bodies, the corpuscles.

Результаты (русский) 1:

1. сердечно-сосудистой системы является система кровообращения. Сердечно-сосудистой системы мы подразумеваем сердца, артерий, вен и капилляров человеческого тела.2. центр сердечно-сосудистой системы является сердцем. Человеческое сердце является органом конусовидной формы, около 5 inches1 длиной и 3 1/2 дюйма широкий. Он весит около 10 ounces2 взрослого мужчины, 6 унций в самку. Он находится в грудной полости, сразу за грудиной и легких. Сердце — полый мышцы, которая имеет четыре камеры. Правое сердце состоит из верхней палаты, атриум или предсердие и нижняя палата, желудочков. Между этими двумя камерами-это односторонний клапан трехстворчатый клапан. Левый сердце имеет две камеры, но клапан, который отделяет его палат мы называем митрального клапана. Хотя сердце блок, анатомически и функционально, мы можем думать о нем на двух насосов - «правое сердце» и «левый сердце». Правое сердце получает кровь из Вены и качает его в легкие через меньшей сердечно-сосудистой системы. В легких кровь получает кислород. Затем он перемещается в левую сердце. От левого сердца хорошо окисленную кровь движется в большой артерии аорты. Кровь возвращается в сердце с помощью вен. Стенки капилляров настолько тонкие, что растворенными пища, которая поступает из пищеварительной системы и кислорода, который поступает из легких может пройти через них в тканях организма и поэтому питают его. Капилляры образуют закрыть сеть по всему телу. Постепенно они объединяются и становятся больше и стать вен.Leftpulmonary artery Pulmonary arteryLeft atriumMitral valve Aortic valve Left ventricle Interventricular septumRight ventricleFig. 3. Diagram of the heart3. Blood vessels that receive blood from the ventricle and lead it away from the heart and towards other organs are arteries («air duct» - Greek). The vessels received this name because the early anatomists assumed that they had been empty in dead persons and had carried air.The artery that takes up the blood from the right ventricle and carries it to the lungs is the pulmonary artery («lungs» - Latin). The pulmonary artery divides in two - one branch leads to the right lung, the other - to the left. The arteries continue to divide and subdivide and form smaller and smaller vessels with thinner and thinner walls. The smallest arteries are the arterioles and these finally divide into capillaries («hairlike» - Latin). We name them so because of their fineness, though actually they are much finer than hairs.4. Gradually the capillaries begin to join into larger vessels. Such larger blood vessels that carry blood to the heart from the organs are the veins. The smallest of these are the venules.5. The particular vein into which the capillaries and venules of the lungs finally unite is the pulmonary vein. The pulmonary vein carries the freshly oxygenated blood to the left auricle. The pulmonary artery and pulmonary vein make up the pulmonary circulation.6. The contraction of the left ventricle forces the blood through a one-way valve into the aorta («to lift up» - Greek). The aorta is the largest artery in the body. It moves upward at first (the ascending aorta), but then arches over dorsally (the arch of the aorta). In its downward course, the aorta passes through the diaphragm.7. The blood is a red fluid, which coagulates when escapes from a blood vessel. It consists of a colourless fluid, plasma or serum, and many millions of minute bodies, the corpuscles.