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Bioelement – Definition, Types and Importance

Bioelements are chemical elements that make up living organisms and fulfil vital biological functions. They form the foundation of all life-sustaining processes in the human body.

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Things worth knowing about "Bioelement"

Bioelements are chemical elements that make up living organisms and fulfil vital biological functions. They form the foundation of all life-sustaining processes in the human body.

What Is a Bioelement?

A bioelement is any chemical element that occurs in living organisms and is essential for biological processes. The human body is largely composed of a limited set of these elements, which together provide the structural and functional basis for life.

Bioelements are distinguished from non-biologically relevant elements by their function and abundance in the organism. Approximately 25 to 30 elements are considered essential or conditionally essential for human life.

Classification of Bioelements

Major Elements (Bulk Elements)

The four most abundant bioelements in the human body are referred to as major elements or organogenic elements. Together they account for over 96% of total body mass:

Oxygen (O) – approx. 65% of body mass; a component of water and virtually all organic molecules
Carbon (C) – approx. 18%; the central element of all organic compounds
Hydrogen (H) – approx. 10%; also a component of water and organic molecules
Nitrogen (N) – approx. 3%; essential for proteins, DNA, and RNA

Macrominerals

Macrominerals are bioelements present in the body in larger quantities than trace elements, though still far less than the four major elements. They include:

Calcium (Ca) – essential for bones, teeth, and muscle contraction
Phosphorus (P) – a component of DNA, RNA, and energy carriers such as ATP
Potassium (K) – essential for nerve function and fluid balance
Sulfur (S) – a building block of certain amino acids and proteins
Sodium (Na) – regulates fluid balance and nerve signal transmission
Chlorine (Cl) – important for acid-base balance
Magnesium (Mg) – a cofactor of numerous enzymes and significant for muscle and nerve function

Trace Elements

Trace elements are bioelements present in the body in very small amounts, yet they fulfil vital functions. Examples include:

Iron (Fe) – essential for oxygen transport in the blood via haemoglobin
Zinc (Zn) – important for the immune system and many enzyme reactions
Iodine (I) – necessary for the production of thyroid hormones
Copper (Cu) – a component of various enzymes
Selenium (Se) – provides antioxidant protection of cells
Fluorine (F) – strengthens tooth enamel and bones
Manganese (Mn) – a cofactor of enzymes involved in energy metabolism

Biological Importance

Bioelements are involved in virtually all vital processes in the body. They form the building blocks of proteins, nucleic acids (DNA, RNA), carbohydrates, and lipids. They also regulate fluid balance, acid-base balance, nerve and muscle activity, as well as the function of hormones and enzymes.

A deficiency or excess of specific bioelements can lead to disease. Well-known examples include iron deficiency anaemia, iodine deficiency goitre, and hyperkalaemia (excess potassium in the blood).

Dietary Intake and Requirements

The body's requirement for bioelements is met through a balanced diet. Certain population groups -- such as pregnant women, children, older adults, or individuals with gastrointestinal disorders -- have increased requirements or impaired absorption, and may benefit from targeted supplementation. Official recommendations for daily intake are issued by organisations such as the World Health Organization (WHO) and national nutrition bodies.

References

World Health Organization (WHO): Trace Elements in Human Nutrition and Health. Geneva, 1996.
Stryer, L.; Berg, J.M.; Tymoczko, J.L.: Biochemistry. 8th edition, W.H. Freeman and Company, New York 2015.
Institute of Medicine (IOM): Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. National Academies Press, Washington D.C. 2001.

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