what makes up the circulatory system?
111297
The circulatory system comprises all structures that relate to the circulation of blood throughout the body.  This includes the heart, the aorta (main artery coming out of the heart), the major organ arteries, the smaller branch arteries going into the organs, arterioles (even smaller branch arteries), capillaries (fine, almost microscopic vessels where oxygen and nutrients are delivered to the organ), venules (small veins that start the return of blood away from the organ), small veins, larger veins, inferior vean cava (main vein from the lower 2/3 of the body), superior vena cava (main vein from the upper 1/3 of the body), and finally the heart again.  The circulatory system is essentially a closed plumbing system, driven by the beating of the heart.
278978
. 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).
537443
Circulatory is just like a train or subway. It carries all the blood lightening fast through the body, then back to the station at the heart.
596955
The circulatory system absorbs the stuff you eat once it's broken down.  The lymphatic system helps protect you from bad stuff you've eaten.
957391
You can think of blood made from two basic components. First are the cellular components or the red and white blood cells. They are made in the bone marrow and some white cells in the lymph nodes. The watery part is the blood plasma and contains all the hormones, the water, the sugars, dissolved blood gasses, plasma proteins made in the bone marrow and liver and a host of other substances.
920268
heart and lungs\n\nhttp://www.ama-assn.org/ama/pub/category/7166.html
836877
Smooth muscle. It is part of the autonomic nervous system. This muscle helps to control the pressure and flow in the arteries of the body.
165602
You can visit the Encarta Website. Specific\n\nSystemic Circulation:Heart-Body\nhttp://encarta.msn.com/encyclopedia_761566878/Circulatory_System.html\n\nPulmonary Circulation:Body-Heart\nhttp://encarta.msn.com/encyclopedia_761566878_2/Circulatory_System.html
867849
The brain is not part of the circulatory system........it's infact part of the nervous system. \n\nThe nervous system of an animal coordinates the activity of the muscles, monitors the organs, constructs and also stops input from the senses, and initiates actions as well. \n\nThe circulatory system consists of the heart, blood vessels, arteries, veins, capillaries, platelets and the plasma.  It's basically is an organ system that moves substances to and from cells.
1175801
http://en.wikipedia.org/wiki/Circulatory_system
604046
1.Closed circulatory system with 5 aortic arches \n2.Complete specialized digestive tract\n3.Regeneration of lost parts
266243
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.
135480
THere are a lot of ways. Entire textbooks are dedicated to this. Almost any way you can think of. IN terms of energy, bloodflow, chemical composition, excretion body composistion hormones....
765260
Each cell must have the ability to get oxygen, nutrients, get rid of waste products like CO2. This is accomplished by the fluid in the tissues and the fluid around each cell. When blood goes through a capillary fluid can leak to the tissues, this is where it comes from. Now through the process of osmosis some of this fluid must go back into the circulatory system, but not all of it does. The fluids left over makes up the lymphatic fluid and is carried in lymphatic vessels.
574341
(1)Heart is  the hollow muscular organ that receives blood from the veins and propels it into and through the arteries.\n(2)It helps to bring blood from the body returns to the right atrium through two large veins, the superior and inferior venae cavae; in addition the blood that has supplied the heart muscle is drained directly into the right atrium through the coronary sinus.
766541
Circulatory - keeps the blood and nutrients circulating to all vital organs\nRespiratory - provides oxygen to the blood system, and eliminates CO2\nNeurological - controls the other systems\nDigestive - provides the nutrients circulated by the blood system, and excretes the waste products, ridding the body of toxins\nRenal - maintains healthy fluid balance so that the blood can flow through the body with ease, also eliminates waste products, ridding the body of toxins
1068530
Wow, I don't know if they'd let me type 1000 pages on the subject to cover your question even close to adequately, but I'll give the Reader's Digest version a go...\n\nThe circulatory system is a liquid highway your body uses to transport oxygen and nutrients everywhere they need to go and waste products away from those tissues to be disposed.  The heart is a just a positive displacement pump that keeps your blood flowing through the arteries and veins.  Lungs serve as an interface between the circulatory system and the outside world, a place where oxygen can be drawn into the body through the thin membranes of the alveoli to be absorbed by red blood cells and bound by the hemoglobin molecules within, to be carried to every point in the body.  The lungs are also the place where carbon dioxide, also bound by hemoglobin and brought to lungs for disposal, can pass back out and be exhaled.  Much of this system is automatic and completely involuntary, and some of it isn't even controlled by the brain, at least not directly -- you can hold your breath, for instance, but you do have to consciously think about not breathing.  Your brain does have some say in how fast everything works, sending a message to your heart and lungs during times of stress or exertion to say, "Hey!  We're working kind of hard here; maybe we need more oxygen to the muscles!  Work a little faster, please!" and you start to breathe hard and your heart starts to beat faster.