Main Chemical Elements in the Body
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each of the black spaces below before clicking
on it to display the answer.
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| element sign for OXYGEN | O
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| element sign for HYDROGEN | H
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| element sign for NITROGEN | N
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| element sign for CALCIUM | Ca
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| element sign for PHOSPHORUS | P
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| element sign for POTASSIUM | K
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| element sign for SULFUR | S
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| element sign for SODIUM | Na
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| element sign for CHLORINE | Cl
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| element sign for MAGNESIUM | Mg
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| element sign for IRON | Fe
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| OXYGEN % total body mass | 65.0
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| CARBON % total body mass | 18.5
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| HYDROGEN % total body mass | 9.5
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| NITROGEN % total body mass | 3.2
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| CALCIUM % total body mass | 1.5
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| PHOSPHORUS % total body mass | 1.0
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| SULFUR % total body mass | 0.25
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| SODIUM % total body mass | 0.2
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| element sign for CARBON | C
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| significance of OXYGEN | part of water, used to make ATP
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| significance of CARBON | forms bacbone chains, rings of all organic molecules: carbohydrates, lipids, protiens, nucleic acids
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| significance of HYDROGEN | part of waterand most organic molecules, ionized form makes body fluids more acidic
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| significance of NITROGEN | component of all protiens & nucleic acids
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| significance of CALCIUM | makes bones and teeth harder, ionized form needed for blood clotting, release of some hormones, contraction of muscles, and other processes
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| significance of PHOSPHORUS | component of nucleic acids, & ATP, needed for normal bone and tooth structure
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| significance of POTASSIUM | ionized form is most plentiful cation in intracellular fluid, needed in making generating action potentials
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| significance of SULFUR | component of some vitamins and many proteins
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| significance of SODIUM | ionized form is most plentiful cation in extracellular fluid, needed for maintaining water balance to generate action potentials
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| significance of CHLORINE | ionized form is most plentiful anion in extracellualr fluid, needed for maintaining water balance
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| significance of MAGNESIUM | ionized needed for action of many enzymes
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| significance of IRON | ionized forms are part of hemoglobin (in red blood cells) and some enzymes
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| POTASSIUM % total body mass | 1.0
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| CHLORINE % total body mass | 0.2
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| MAGNESIUM % total body mass | 0.1
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| IRON % total body mass | 0.005
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