[ Home page ] [ Faculty and Staff ] [ Teaching ] [ Research ]
PERCENT COMPOSITION OF THE HUMAN BODY BY MASS
MAJOR ELEMENTS |
||
OXYGEN | 62.5 | |
CARBON | 19.5 | |
HYDROGEN | 10.0 | |
NITROGEN | 3.0 |
|
MAJOR MINERALS | TRACE MINERALS |
|
CALCIUM | 1.7 | IRON |
PHOSPHOROUS | 0.9 | IODINE |
POTASSIUM | 0.3 | ZINC |
SULFUR | 0.2 | CHROMIUM |
SODIUM | 0.2 | SELENIUM |
CHLORINE | 0.2 | FLUORINE |
MAGNESIUM | 0.04 | COBALT MOLYBDENUM COPPER MANGANESE VANADIUM TIN SILICON NICKEL |
Elemental composition of human body
You are a mixture of thousands of compounds that are constantly being used and replaced by chemical reactions. These compounds either are obtained directly from food sources or are formed by chemical reactions from compounds in foods.
The elemental composition of the human body is given in the table.
Your body contains about 60% water (40% intracellular fluid; 20% extracellular fluid), which consist of hydrogen and oxygen. Another substantial fraction of body weight consists of organic compounds (compounds containing carbon) such as fats, carbohydrates, and proteins. These compounds all contain carbon, hydrogen, and oxygen; proteins contain nitrogen as well.
Nutritionists characterize another fraction of your body as major minerals. The major minerals calcium and phosphorous are in the bones as calcium phosphate. Calcium also exists in body fluids as calcium ion. Sodium, potassium, and chlorine are important components of body fluids both surrounding cells and within them.
The trace minerals are present in quantity barely large enough to fill teaspoon. However, each of them plays a vital role in maintaining life, having a function for which there is no substitute. In many cases not only a deficiency but also an excess would be fatal.
Iron is contained in every cell, but most of the iron in the body is found in hemoglobin and myoglobin, two of the oxygen needed for life processes.
Zinc occurs in over 70 enzymes that regulate biochemical reactions.
Copper and manganese, about 100 and 20 mg respectively are also components of certain enzymes.
Iodine is needed in three thyroid hormones that regulate metabolic rate.
MAJOR MINERALS
CALCIUM
Occurrence in human body:
Extracellular cation. Almost all of calcium is in the bones and teeth in form of hydroxyapatite ~
Plasma:
There are three forms of Ca in plasma:
Bodily function facilitated:
PHOSPHORUS
Occurrence in human body:
Most
Phosphates are components of blood buffer systems.
Bodily function facilitated:
POTASSIUM
Occurrence in human body:
K+ is principle cation of intracellular
ICF concentration: 115 mmol/l; in serum:
Bodily function facilitated:
SULFUR
Occurrence in human body:
Sulfur is present in all cells of the body primarily in the cell protein (presence of the two
Bodily function facilitated:
SODIUM
Occurrence in human body:
Na+ is principle cation of extracellular
In serum:
Bodily function facilitated:
CHLORINE
Occurrence in human body:
Chlorides are the principal extracellular anions.
In serum
Bodily function facilitated:
MAGNESIUM
Occurrence in human body:
Cation of intracellular fluid
In plasma:
Magnesium participates in all biochemical a physiological processes because of their ability to activate
Bodily function facilitated:
TRACE MINERALS
IRON
Occurrence in human body:
Fe is in molecule of hemoglobin and myoglobin. Hem is component of cytochroms.
In organism, Fe is stored in ferritin. Fe is transported with transferin in blood.
Bodily function facilitated:
IODINE
Occurrence in human body:
I is necessary for function of thyroid gland. Iodine is in thyroid hormones.
Bodily function facilitated:
ZINC
Occurrence in human body:
Zinc is namely intracellular element.
Zinc is component of some enzymes (carbonatanhydrase, lactatdehydrogenase, alcoholdehydrogenase and superoxiddismutase).
Zinc is an activator of about 230 enzymes.
Bodily function facilitated:
CHROMIUM
Bodily function facilitated:
SELENIUM
Occurrence in human body:
It is component of some enzymes e.g. glutathionperoxidase
Bodily function facilitated:
FLUORINE
It is in bones and teeth.
COBALT
It is component
Bodily function facilitated:
MOLYBDENUM
It is component of enzyme xanthinoxidase and activator of many enzymes.
Bodily function facilitated:
COPPER
It is component of some oxidoreductases
Bodily function facilitated:
MANGANESE
It is component of enzyme xanthinoxidase and activator of many enzymes.
Bodily function facilitated:
VANADIUM
Appropriate amounts decreases cholesterol level in blood.
TIN
It is supposed, that it is necessary for optimal growth and blood formation.
SILICON
Bodily function facilitated:
NICKEL
Bodily function facilitated:
Activator of some important enzymes e.g. alkaline phosphatase