How is blood formed in the human body?
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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.
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Basically there are numerous cells in the body composing of white blood cell and red blood cell
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The heart is a powerful muscle slightly larger than your clenched fist. It works as a pump to send oxygen-rich blood through all parts of your body. Blood contains oxygen and nutrients that every cell in your body needs to survive. The oxygen-rich blood travels throughout the arteries and vessels, nourishing the body so that it can function properly.\n\nYour heart will beat an average of 100,000 times per day. In that time, it pumps more than 4,300 gallons of blood throughout your entire body.
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Blood is composed of several kinds of corpuscles; these formed elements of the blood constitute about 40% of whole blood. The other 60% is blood plasma, a fluid that is the blood's liquid medium, appearing yellow in color. The normal pH of human arterial blood is approximately 7.40 (normal range is 7.35-7.45). Blood that has a pH below 7.35 is acidic, while blood pH above 7.45 is alkaline. Blood pH along with arterial carbon dioxide tension (PaCO2) and HCO3 readings are helpful in determining the acid-base balance of the body. Blood is about 7% of the human body weight [1], so the average adult has a blood volume of about 5 liters, of which 2.7-3 liters is plasma. The combined surface area of all the erythrocytes in the human anatomy would be roughly 2,000 times as great as the body's exterior surface.\n\nThe corpuscles are:\n\n    * Red blood cells or erythrocytes (96%). In mammals, mature red blood cells lack a nucleus and organelles. They contain the blood's hemoglobin and distribute oxygen. The red blood cells (together with endothelial vessel cells and some other cells) are also marked by proteins that define different blood types.\n    * White blood cells or leukocytes (3.0%), are part of the immune system; they destroy infectious agents.\n    * Platelets or thrombocytes (1.0%) are responsible for blood clotting (coagulation)\n\nBlood plasma is essentially an aqueous solution containing 96% water, 4% blood plasma proteins, and trace amounts of other materials. Some components are:\n\n    * albumin\n    * blood clotting factors\n    * immunoglobulins (antibodies)\n    * hormones\n    * various other proteins\n    * various electrolytes (mainly sodium and chlorine)\n\nTogether, plasma and corpuscles form a non-Newtonian fluid whose flow properties are uniquely adapted to the architecture of the blood vessels.
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Without blood cells, your blood is a watery straw colored substance, and mostly consists of blood plasma and and a huge assortment of dissolved proteins, hormones, and sugars and fats.
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The spleen filters blood and gets rid of the old and dying red blood cells.  The spleen also hold extra blood within it.\n\nBone marrow is where red blood cells are produced.
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All human tissue and body parts are made of cells. They are the building blocks of all living creatures.
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bone marrow cells produce blood cells.
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chk out \nhttp://www.emc.maricopa.edu/faculty/farabee/biobk/BioBookRESPSYS.html\n4 respiration\n\n4 blood clotting\nHow does the blood clot?\nThere are two major facets of the clotting mechanism – the platelets, and the thrombin system.\nThe platelets are tiny cellular elements, made in the bone marrow, that travel in the bloodstream waiting for a bleeding problem to develop. When bleeding occurs, chemical reactions change the surface of the platelet to make it “sticky.” Sticky platelets are said to have become “activated.” These activated platelets begin adhering to the wall of the blood vessel at the site of bleeding, and within a few minutes they form what is called a “white clot.” (A clump of platelets appears white to the naked eye.)\n\nThe thrombin system consists of several blood proteins that, when bleeding occurs, become activated. The activated clotting proteins engage in a cascade of chemical reactions that finally produce a substance called fibrin. Fibrin can be thought of as a long, sticky string. Fibrin strands stick to the exposed vessel wall, clumping together and forming a web-like complex of strands. Red blood cells become caught up in the web, and a “red clot” forms.\n\nA mature blood clot consists of both platelets and fibrin strands. The strands of fibrin bind the platelets together, and “tighten” the clot to make it stable.\n\nIn arteries, the primary clotting mechanism depends on platelets. In veins, the primary clotting mechanism depends on the thrombin system. But in reality, both platelets and thrombin are involved, to one degree or another, in all blood clotting.
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The red blood cells have a special oxygen transport molecule called hemoglobin. It has an iron atom in the middle of it that binds to the oxygen very loosely in the lungs where oxygen is plentiful. Then, when the red blood cell reaches tissue that has a low oxygen concentration, the loosely bound oxygen dissociates from the hemoglobin, ready to be used by the cells in the body.\n\nThe right side of the heart pumps blood to the lungs where the oxygen is picked up. Then the blood goes back to the left side of the heart to be pumped out to the rest of the body so the oxygen can be delivered.
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liver\nliver, largest glandular organ of the body, weighing about 3 lb (1.36 kg). It is reddish brown in color and is divided into four lobes of unequal size and shape. The liver lies on the right side of the abdominal cavity beneath the diaphragm. Blood is carried to the liver via two large vessels: the hepatic artery carries oxygen-rich blood from the aorta, and the portal vein carries blood containing digested food from the small intestine. These blood vessels subdivide in the liver repeatedly, terminating in minute capillaries. Each capillary leads to a lobule. Liver tissue is composed of thousands of lobules, and each lobule is made up of hepatic cells, the basic metabolic cells of the liver. One of the liver's major functions is the manufacture and secretion of bile, which is stored in the gall bladder and released in the small intestine. Bile salts emulsify fats, a process that prepares the latter for digestion by the intestinal enzymes (see digestive system). The hepatic cells assimilate carbohydrates, fats, and proteins. They convert glucose to its stored form, glycogen, which is reconverted into glucose as the body requires it for energy. The ability of the liver to maintain the proper level of glucose in the blood is called its glucose buffer function. The end products of fat digestion, fatty acids, are used to synthesize cholesterol and other substances needed by the body. Excess carbohydrates and protein are also converted into fat by the liver. Digested proteins in the form of amino acids are broken down further in the liver by deamination. Part of the amino acid molecule is converted into glycogen and other compounds. Urea, a waste product of protein breakdown, is produced by the liver, a process which removes poisonous ammonia from the body fluids. The liver is also capable of synthesizing certain amino acids (the so-called nonessential amino acids) from other amino acids in a process called transamination. Some essential components of blood are manufactured by the liver, including about 95% of the plasma proteins and the blood-clotting substances (fibrinogen, prothrombin, and other coagulation factors). The liver also filters harmful substances from the blood. Phagocytic cells in the liver, called Kupffer cells, remove large amounts of debris and bacteria. In addition, the liver stores important vitamins and minerals, including vitamins A, D, K, and B12. Several diseases states can affect the liver, such as hepatitis (an inflammation of the liver) and cirrhosis (a chronic inflammation that progresses ultimately to organ failure). Alcohol alters the metabolism of the liver, which can have overall detrimental effects over long periods of abuse. In 1994, a bioartificial liver, part machine, part cloned living liver cells, was used for the first time. Functioning somewhat like a kidney dialysis machine, the bioartificial liver can support patients with acute liver failure until their own livers regenerate, or it can be used by patients while waiting for a liver transplant.
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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.
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3/4 th of the human body is water. Blood is the best medium for water to circulate the water along with blood, so that no part of body gets dehydrated.The blood mostly consists of plasma which is mostly water. Thus most of the blood or almost all the blood is water.
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Blood's role in the body is three fold: First, it acts as a transort system for nurtients and such to reach the different parts of the body. Secondly as a defence system, where lymphocytes are active in controlling pathogens that enter the body (such as bacteria, viruses, fungi, etc). Lastly, the blood acts as a sealant. When there is damage to the body, the platelets in the blood seal up the wound.\n\nBlood is very important to the body. Without it, you wouldn't exist.
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Blood is blue when it's not oxygenated, for instance when it's in veins, which return blood to the heart to be refilled with oxygen after it's been used.  Veins are those blue lines you can see under people's skin-- that's blood.  Blood in arteries (which are usually lower than veins and thus not visible through people's skin) is red. \n \nSo, to summarize, red oxygenated blood leaves the heart and goes around to the rest of your body, where it fuels your muscles and organs.  They use up the oxygen, turning it blue.  Via the veins-- those little blue lines that are visible sometimes in people's neck or hands-- the blood returns to be filled again with oxygen. \n \nWhen you cut yourself, the blood becomes oxygenated as soon as it hits the air, so that's why regardless of where it comes from it's always red by the time you see it. \n \n<3
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The heart is a fist-sized, muscular organ that pumps blood through the body. Oxygen-poor blood enters the right atrium of the heart (via veins called the inferior vena cava and the superior vena cava). The blood is then pumped into the right ventricle and then through the pulmonary artery to the lungs, where the blood is enriched with oxygen (and loses carbon dioxide). The oxygen-rich (oxygenated) blood is then carried back to the left atrium of the heart via the pulmonary vein. The blood is then pumped to the left ventricle, then the blood is pumped through the aorta and to the rest of the body. This cycle is then repeated. Every day, the heart pumps about 2,000 gallons (7,600 liters) of blood, beating about 100,000 times. enchantedlearning.com
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I know that bone marrow is responsible for creating red blood cells.\n\nHere's something more specific:\n\nsoft tissue filling the spongy interiors of animal bones. Red marrow is the principal organ that forms blood cells in mammals, including humans (see blood). In children, the bones contain only red marrow. As the skeleton matures, fat-storing yellow marrow displaces red marrow in the shafts of the long bones of the limbs. In adults red marrow remains chiefly in the ribs, the vertebrae, the pelvic bones, and the skull. Erythrocytes (red blood cells), platelets, and all but one kind of leukocyte (white blood cell) are manufactured in human red marrow. The marrow releases about 10 million to 15 million new erythrocytes every second, while an equivalent number are destroyed by the spleen.