What are the three largest organs in the human body?
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Skin, lungs, and liver.
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smallest to largest in a multicellular organism.\ncell-tissue-organ-organ system-organism
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blood, fluid pumped by the heart that circulates throughout the body via the arteries, veins, and capillaries (see circulatory system; heart). An adult male of average size normally has about 6 quarts (5.6 liters) of blood. The blood carries oxygen and nutrients to the body tissues and removes carbon dioxide and other wastes. The colorless fluid of the blood, or plasma, carries the red and white blood cells, platelets, waste products, and various other cells and substances
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All Parts.Every organ.
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The urinary system entails the kidneys(2 normally), the bladder, 2 ureters(tubes from kidneys to bladder), and the urethra (tube from bladder to opening in the body).\n\nLook in any anatomy and physiology book or yahoo health.
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organ: brain\nmolecule: DNA
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Common animal (including human) organs include the heart, lungs, brain, eye, stomach, spleen, pancreas, kidneys, liver, intestines, skin, uterus, and bladder.\n\nBlood vessels exist in varying calibers:\n\nArteries \nAorta (the largest artery, carries blood out of the heart) \nBranches of the aorta, such as the carotid artery, the subclavian artery, the celiac trunk, the mesenteric arteries, the renal artery and the ileac artery. \nArterioles \nCapillaries (the smallest blood vessels) \nVenules \nVeins \nLarge collecting vessels, such as the subclavian vein, the jugular vein, the renal vein and the iliac vein. \nVenae cavae (the 2 largest veins, carry blood into the heart)
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It's generally considered the skin.  The largest internal organ is the liver.
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The human body is made up of four different tissues:\n1- epithelial: protective and covering\n            secretory\n2- connective: proper\n            bone\n            cartilage\n            blood and blood forming tissue\n3-muscular: skeletal(striated, voluntary)\n          visceral(smooth, involuntary)\n          cardiac(striated, involuntary)\n4-nervous: neurons transmitting the nervous impulse and neuroglia supporting, anchoring and protecting the neurons.
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Cells, of course, vary in size. The largest cell on earth is an ostrich egg. The smallest cell is a tiny bacteria. In warm-blooded animals, the reproductive cells are the largest and the smallest — in other words, the sperm cell is the smallest cell in the body of a human or any other mammal, and the egg cell is the largest.\n\nThe largest cell in the human body is the female ovum, or egg cell. It is about 1/180 inch in diameter. The smallest cell in the human body is the male sperm. It takes about 175,000 sperm cells to weigh as much as a single egg cell.
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organ. The others actually are organs, while 'organ' is the name of the category they fall into.
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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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Liver:The liver is the largest internal organ in the human body\nFunction:It plays a major role in metabolism and has a number of functions in the body including glycogen storage, plasma protein synthesis, and drug detoxification.\nIt also produces bile,\nGall bladder:A part of Digestive system\n\nSpleen:Lymphatic system\nFunction:The spleen is a ductless, vertebrate gland that is not necessary for life but is closely associated with the circulatory system, where it functions in the destruction of old red blood cells.\n\nPancreas:A part of Digestive system and Endocrine system.\n\nPericardium:The pericardium is a double-walled sac that contains the heart \n\nCardiac valve:circulatory system\n\npyloric valve:Digestive system\nAt the end of pyloric stomach is presnt a strong circular muscle band,called pyloric valve
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organs are things that process fluids or minerals for us. skeletons and muscles dont do that, they support us and provide mobility.
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There are two organ systems that work in conjunction with each other to provide tissues with oxygen and remove carbon dioxide.  Those are the respiratory and the circulatory system (the major organs of these systems being the lungs and the heart respectively).\n\nNutrients are provided by the combined actions of the digestive and circulatory system, and wastes are removed through the combined actions of the circulatory and excretory systems.
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Assuming you're talking about a human being; but should be applicable to all animals containing such organs:\n\nFor existence in general; the heart, as the body can 'live' without a functioning brain or liver for a while.\n\nThen the liver, since eventually the body would poison itself.\n\nThen the brain.\n\nHowever, if you're talking about complete 'removal', you need to define the brain. Are you speaking of the cerebral cortex alone or the whole thing? In the latter case, the heart and brain are equivelent since the lower brain stem controls heart rate (as well as other vital; functions,) and without either, neither would function and the body would die within minutes.
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The human body, consists of an estimated 20 to 30 trillion cells.