The cardiovascular system is the system responsible for delivering blood to different parts of the body. It consists of the following organs and tissues:. There are two blood circulatory systems in the body. The first is the systemic circulatory system. This is the main blood circulatory system that transports blood to the organs, tissues, and cells throughout the body.
The second is the pulmonary circulatory system. This circulatory system moves blood between the heart and lungs. It is where oxygen enters the blood and carbon dioxide leaves the blood. Valves control the flow of blood within the different chambers. Blood follows the following path through the heart:. The heart pumps blood through closed vessels to every tissue within the body.
The blood itself then delivers nutrients and oxygen to all cells in the body. Without blood, the cells and tissues would not function at their total capacity and would begin to malfunction and die. The cardiac cycle consists of two phases. The first phase is diastole, in which the ventricles fill with blood. It begins when the aortic or pulmonary valve closes and ends when the mitral or tricuspid valve closes.
During diastole, blood vessels return blood to the heart in preparation for the next contraction of the ventricles. The second phase is systole, in which the ventricles contract and eject blood. It begins when the mitral or tricuspid valve closes and ends when the aortic or pulmonary valve closes.
The pressure inside the ventricles becomes greater than the pressure inside adjacent blood vessels, thereby forcing the blood from the ventricles to the vessels. Cardiovascular diseases can be severe and potentially life threatening. Understanding conditions that can affect the cardiovascular system may help people seek appropriate and timely medical advice. The purpose of this system is to keep all the cells in your body supplied with fresh oxygen and nutrients while removing carbon dioxide and other waste products.
Several different types of conditions can affect your circulatory system. Many of these conditions involve some type of blood vessel blockage, which can lower oxygen delivery to vital organs.
There are steps you can take to keep your circulatory system as healthy as possible. Some key steps include getting regular exercise, eating heart-healthy foods, not smoking, and maintaining a moderate weight. Regular visits to your doctor can also help identify and treat any potential problems before they become more serious issues. Read this article in Spanish. Experts say there are a number of ways to make it easier to go to bed at a proper time, including when you exercise and when you eat.
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As the name implies, blood contained in the circulatory system is pumped by the heart around a closed circle or circuit of vessels as it passes again and again through the various "circulations" of the body. As in the adult, survival of the developing embryo depends on the circulation of blood to maintain homeostasis and a favorable cellular environment.
Twenty major arteries make a path through your tissues, where they branch into smaller vessels called arterioles. Arterioles further branch into capillaries, the true deliverers of oxygen and nutrients to your cells. Most capillaries are thinner than a hair. In fact, many are so tiny only one blood cell can move through them at a time. Once the capillaries deliver oxygen and nutrients and pick up carbon dioxide and other waste, they move the blood back through wider vessels called venules.
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