Arteries
The pulmonary system starts as with the single pulmonary artery that leaves the right ventricle and shortly after divides into the right and left branches. Each of these branches enter the lungs and divide to ultimately be involved in the gaseous exchange that takes place in the lungs. The aorta leaves the heart via the left ventricle and very shortly after divides to provide the two coronary arteries that supply blood to the heart itself. Shortly after that the first of many divisions occur. Blood from the aorta is supplied to the head, the thoracic region including the wings, the abdominal region including the legs and tail.
New or oxygenated blood is bright red while old or deoxygenated blood is a very dark colour. In the pulmonary system, the arteries carry old blood while the veins carry new blood. In the main circulatory system, the arteries carry new blood and the veins carry old (arteries carry blood away from the heart and veins carry blood to the heart). As the arteries divide they become smaller and smaller until they form very small arteries which are often referred to as arterioles. When they enter the target organ they divide to become very thin walled capillaries and it is from these that the oxygen, nutrients, wastes and other factors either leave or enter the system.
Arteries
The pulmonary system starts as with the single pulmonary artery that leaves the right ventricle and shortly after divides into the right and left branches. Each of these branches enter the lungs and divide to ultimately be involved in the gaseous exchange that takes place in the lungs. The aorta leaves the heart via the left ventricle and very shortly after divides to provide the two coronary arteries that supply blood to the heart itself. Shortly after that the first of many divisions occur. Blood from the aorta is supplied to the head, the thoracic region including the wings, the abdominal region including the legs and tail.
New or oxygenated blood is bright red while old or deoxygenated blood is a very dark colour. In the pulmonary system, the arteries carry old blood while the veins carry new blood. In the main circulatory system, the arteries carry new blood and the veins carry old (arteries carry blood away from the heart and veins carry blood to the heart). As the arteries divide they become smaller and smaller until they form very small arteries which are often referred to as arterioles. When they enter the target organ they divide to become very thin walled capillaries and it is from these that the oxygen, nutrients, wastes and other factors either leave or enter the system.
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