what does the circulatory system do?
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The circulatory system (sometimes cardiovascular system) is an organ system that moves substances to and from cells; it can also help stabilize body temperature and pH (part of homeostasis). \nSimply - it is primarily the system of blood transport that moves around nutrients and oxygen to all parts of your body...
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The lungs (respiratory system) take in air (using the oxygen and breathing out the carbon dioxide), the heart pumps the oxygen through our arteries (circulatory system)making our blood red.
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The vertebrate cardiovascular system includes a heart, which is a muscular pump that contracts to propel blood out to the body through arteries, and a series of blood vessels. The upper chamber of the heart, the atrium (pl. atria), is where the blood enters the heart. Passing through a valve, blood enters the lower chamber, the ventricle. Contraction of the ventricle forces blood from the heart through an artery. The heart muscle is composed of cardiac muscle cells.
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In order for your heart to pump well, it needs oxygen, and it obtains it from the coronary arteries that are connected to the aorta. \nCoronary arteries - like any other organ or tissue, the heart needs oxygen. The coronary arteries that supply the heart are connected directly to the aorta, which ensures a rich supply of oxygenated blood.
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Arteries are muscular blood vessels that carry blood away from the heart. They are contrasted with veins, which carry blood toward the heart.\n\nThe circulatory system is extremely important in sustaining life. Its proper functioning is responsible for the delivery of oxygen and nutrients to all cells, as well as the removal of carbon dioxide and waste products, maintenance of optimum pH, and the mobility of the elements, proteins and cells of the immune system. In developed countries, the two leading causes of death, myocardial infarction and stroke each may directly result from an arterial system that has been slowly and progressively compromised by years of deterioration.
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Arteries\n\nThere are two major kinds of blood vessels, veins and arteries. arteries run from the heart to all the other body parts, and the heart pumps fresh blood into the arteries. All the cells in the body draw nourishment and oxygen from this blood and leave out waste and carbon dioxide. The veins then carry this impure blood back to the heart. The blood that goes to the lungs brings back extra oxygen and the liver and the small intestine play a major role in introducing nourishment into the blood stream
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mainly, the heart pumps blood forward, but can be aided by the action of the muscles--they help keep blood and lymph flowing.  Additonailly, the veins have one way valves so that once the blood goes through a valve, it can't go backwards while the heart is relaxing.
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In the human anatomy, we have 2 atria and 2 ventricles.  The ventricle structure works like a bladder in a water pump to create the pressure to push the blood out into the circulatory system.  After the ventricle contracts and is empty, a supply of blood is needed to refill for the next contraction.  Think of the atrium as a bucket ready to dump into the ventricle.  It allows fast refill at low pressure.
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According to the site below:\n\nThe time it takes blood to circulate in the human vascular system varies with age, body size and condition, and whether the person is resting or engaged in vigorous physical and/or emotional activity. Nevertheless, on average the blood fully circulates in the human body some seven to eight times per minute.
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the circulatory system (ie the blood circulatory system) can maintain the temperature of the body by vaso-dilation and vaso constriction of the blood vessels ( both deepseated and superficial) when there is cold or the weather is hot respectively.
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. Structure and Functions of Blood Vessels \n  Structure Functions \nArteries The walls (outer structure) of arteries contain smooth muscle fibre that contract and relax under the instructions of the sympathetic nervous system.\n   Transport blood away from the heart;\n \n  Transport oxygenated blood only (except in the case of the pulmonary artery).\n \n \n \nArterioles Arterioles are tiny branches of arteries that lead to capillaries. These are also under the control of the sympathetic nervous system, and constrict and dialate, to regulate blood flow.\n   Transport blood from arteries to capillaries;\n \n  Arterioles are the main regulators of blood flow and pressure.\n \n \n \nCapillaries Capillaries are tiny (extremely narrow) blood vessels, of approximately 5-20 micro-metres \n(one micro-metre = 0.000001metre) diameter.\nThere are networks of capillaries in most of the organs and tissues of the body. These capillaries are supplied with blood by arterioles and drained by venules. Capillary walls are only one cell thick (see diagram), which permits exchanges of material between the contents of the capillary and the surrounding tissue. \n   Function is to supply tissues with components of, and carried by, the blood, and also to remove waste from the surrounding cells ... as opposed to simply moving the blood around the body (in the case of other blood vessels);\n \n  Exchange of oxygen, carbon dioxide, water, salts, etc., between the blood and the surrounding body tissues.\n \n \n \nVenules Venules are minute vessels that drain blood from capillaries and into veins. Many venules unite to form a vein.\n   Drains blood from capillaries into veins, for return to the heart\n \n \n \nVeins The walls (outer structure) of veins consist of three layers of tissues that are thinner and less elastic than the corresponding layers of aerteries.\nVeins include valves that aid the return of blood to the heart by preventing blood from flowing in the reverse direction.\n   Transport blood towards the heart;\n \n  Transport deoxygenated blood only (except in the case of the pulmonary vein).
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The average blood cell makes a round trip through the body's arteries and veins every 60 seconds, and can hit speeds of up to 10 mph. The heart pumps your five quarts of blood around your body 500 times a day.
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The lymphatic system is a good answer as it filters the blood, easing the effort the immune system must make, as well as draining fluid so as to not overwork the circulatory system.  The hematopoietic system (which makes blood cells) also makes the primary components of both systems - white blood cells for the immune system, and all the cellular components on the bloodstream for the circulatory system.
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wouldn't teh functions of the systems be the same for every organisms.  for example the respiratory system is for breathing in both cows and humans and probably for the toad as well.  the circulatory system is for circulating blood in every organsim.  the excretory system extrects toxins and metabolic wastes and the nervous system allows for cordiation of muscles and autonomic behaviors as well as cognitive thinking.  \n\nhowever the real functions of all these organs is SURVIVAL.  SURVIVAL is the driving force of life and you are kidding yourself if you think otherwise.
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The time it takes blood to circulate in the human vascular system varies with age, body size and condition, and whether the person is resting or engaged in vigorous physical and/or emotional activity. Nevertheless, on average the blood fully circulates in the human body some seven to eight times per minute.
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the blood comes into the heart from systemic circulation. it enters the right atrium, then moves through the right atrial ventricular valve to the right ventricle. it pumps up into the pulmonary semilunar valve, goes into the pulmonary trunk and heads to the lungs via the pulmonary artery to pick up oxygen. oxygenated blood then comes back to the heart throught the pulmonary vein, enters the left atrium, goes to the left ventricle through the left atrial ventricular valve, and gets pumped into the aorta to head to systemic circulation again. that answer your question?
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Blood plasma, red blood cells, white blood cells, platelets, and numerous nutrients that are being delivered to various parts of your body.  \n\nStructurally speaking, the circulatory system is a complex set of arteries drawing blood away from your lungs and to every part of your body (including the brain and heart muscle), veins drawing blood toward your lungs, the heart that pumps to keep blood moving, and capillaries that drop of oxygen to cell tissue in exchange for carbon dioxide.