what is the chemical composition of humans?
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Almost 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Only about 0.85% is composed of another five elements: potassium, sulfur, sodium, chlorine, and magnesium.
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Essential trace elements of the human body include zinc (Zn), copper (Cu), selenium (Se), chromium (Cr), cobalt (Co), iodine (I), manga- nese (Mn), and molybdenum (Mo).
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Chemical composition of living matter. Every living cell contains, in addition to water and salts or minerals, a large number of organic compounds, substances composed of carbon combined with varying amounts of hydrogen and usually also of oxygen. Nitrogen, phosphorus, and sulfur are likewise common constituents.
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The four most important elements in cells are carbon, hydrogen, oxygen and nitrogen.
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Thus, in the average human body, there will be 50000 g/ 12 g = 4167 packets of 12 g of carbon each, i.e. 25002 x 10^23 atoms, or, expressed more conventionally, 2.5 x 10^27 atoms. Each of these has six electrons. I.e. the average human body contains about 1.5 x 10^28 electrons.
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All living matter, including people, animals and plants, consists of chemicals. All food is made up of chemical substances. Chemicals in food are largely harmless and often desirable – for example, nutrients such as carbohydrates, protein, fat and fibre are composed of chemical compounds.
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These nutrients comprise the basis of all human nutrition: protein, energy, vitamin A and carotene, vitamin D, vitamin E, vitamin K, thiamine, riboflavin, niacin, vitamin B6, pantothenic acid, biotin, vitamin B12, folate, vitamin C, antioxidants, calcium, iron, zinc, selenium, magnesium and iodine.
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['Oxygen. Oxygen is the most abundant element contained within living organisms, composing about 65% of the human body. ... ', 'Carbon. ... ', 'Hydrogen. ... ', 'Nitrogen. ... ', 'Sulfur. ... ', 'Phosphorus.']
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Percentage composition of a compound is a ratio of an amount of each element to the total amount of individual elements in a compound, which is then multiplied with 100. Let us take an example of H2O i.e. Water. Water has 2 molecules of hydrogen, and one mole of water is of 18.0152 grams.
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Carbohydrates. Carbohydrates are a class of chemical compounds composed of carbon, hydrogen, and oxygen in 1:2:1 ratio, respectively.
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What are the three essential chemical elements in the biosphere? nitrogen, oxygen, and carbon.
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The major chemical components of the chromosome are DNA, RNA (nucleic acids), and proteins (histones and nonhistones).
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Humans are complex organisms made up of trillions of cells, each with their own structure and function. Scientists have come a long way in estimating the number of cells in the average human body. Most recent estimates put the number of cells at around 30 trillion. Written out, that's 30,000,000,000,000!
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The human body contains many salts, of which sodium chloride (AKA common table salt) is the major one, making up around 0.4 per cent of the body's weight at a concentration pretty well equivalent to that in seawater. So a 50kg person would contain around 200g of sodium chloride – around 40 teaspoons.
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The major elements of life are Carbon, hydrogen, phosphorous, sulfur, and nitrogen.
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The most important substances present are hydrocarbons, which are compounds containing only two elements, hydrogen and carbon also small amount of Oxygen, Sulpher and Nitrogen (NSO compounds).  Mostly in oils the hydrogen and carbon comprises 95% to 99% of the total.
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Chemically, foods are composed mainly of water, lipids, proteins, and carbohydrates with small proportions of minerals and organic compounds. Minerals are salts, and organic substances are vitamins, emulsifiers, acids, antioxidants, pigments, polyphenols, flavors, etc. (Raemy and Lambelet, 1991).