Science
The Elemental Composition of the Human Body
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The Elemental Composition of a Human Body
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The human body is a miraculous, well-oiled, and exceptionally complex machine. It requires a multitude of functioning parts to come together for a person to live a healthy life—and every biological detail in our bodies, from the mundane to the most magical, is driven by just 21 chemical elements.
Of the 118 elements on Earth, just 21 of them are found in the human body. Together, they make up the medley of divergent molecules that combine to form our DNA, cells, tissues, and organs.
Based on data presented by the International Commission on Radiological Protection (ICRP), in the above infographic, we have broken down a human body to its elemental composition and the percentages in which they exist.
These 21 elements can be categorized into three major blocks depending on the amount found in a human body, the main building block (4 elements), essential minerals (8 elements), and trace elements (9 elements).
The Elemental Four: Ingredients for Life
Four elements, namely, oxygen, carbon, hydrogen, and nitrogen, are considered the most essential elements found in our body.
Oxygen is the most abundant element in the human body, accounting for approximately 61% of a person’s mass. Given that around 60-70% of the body is water, it is no surprise that oxygen and hydrogen are two of the body’s most abundantly found chemical elements. Along with carbon and nitrogen, these elements combine for 96% of the body’s mass.
Here is a look at the composition of the four elements of life:
Element | Weight of Body Mass (kg) | Percentage of Body Mass (%) |
---|---|---|
Oxygen | 43 kg | 61.4% |
Carbon | 16 kg | 22.9% |
Hydrogen | 7.0 kg | 10.0% |
Nitrogen | 1.8 kg | 2.6% |
Values are for an average human body weighing 70 kg.
Let’s take a look at how each of these four chemical elements contributes to the thriving functionality of our body:
Oxygen
Oxygen plays a critical role in the body’s metabolism, respiration, and cellular oxygenation. Oxygen is also found in every significant organic molecule in the body, including proteins, carbohydrates, fats, and nucleic acids. It is a substantial component of everything from our cells and blood to our cerebral and spinal fluid.
Carbon
Carbon is the most crucial structural element and the reason we are known as carbon-based life forms. It is the basic building block required to form proteins, carbohydrates, and fats. Breaking carbon bonds in carbohydrates and proteins is our primary energy source.
Hydrogen
Hydrogen, the most abundantly found chemical element in the universe, is present in all bodily fluids, allowing the toxins and waste to be transported and eliminated. With the help of hydrogen, joints in our body remain lubricated and able to perform their functions. Hydrogen is also said to have anti-inflammatory and antioxidant properties, helping improve muscle function.
Nitrogen
An essential component of amino acids used to build peptides and proteins is nitrogen. It is also an integral component of the nucleic acids DNA and RNA, the chemical backbone of our genetic information and genealogy.
Essential and Supplemental Minerals
Essential minerals are important for your body to stay healthy. Your body uses minerals for several processes, including keeping your bones, muscles, heart, and brain working properly. Minerals also control beneficial enzyme and hormone production.
Minerals like calcium are a significant component of our bones and are required for bone growth and development, along with muscle contractions. Phosphorus contributes to bone and tooth strength and is vital to metabolizing energy.
Here is a look at the elemental composition of essential minerals:
Element | Weight of Body Mass (g) | Percentage of Body Mass (%) |
---|---|---|
Calcium | 1000 g | 1.43% |
Phosphorus | 780 g | 1.11% |
Potassium | 140 g | 0.20% |
Sulphur | 140 g | 0.20% |
Chlorine | 100 g | 0.14% |
Sodium | 95 g | 0.14% |
Magnesium | 19 g | 0.03% |
Iron | 4.2 g | 0.01% |
Values are for an average human body weighing 70 kg.
Other macro-minerals like magnesium, potassium, iron, and sodium are essential for cell-to-cell communications, like electric transmissions that generate nerve impulses or heart rhythms, and are necessary for maintaining thyroid and bone health.
Excessive deficiency of any of these minerals can cause various disorders in your body. Most humans receive these minerals as a part of their daily diet, including vegetables, meat, legumes, and fruits. In case of deficiencies, though, these minerals are also prescribed as supplements.
Biological Composition of Trace Elements
Trace elements or trace metals are small amounts of minerals found in living tissues. Some of them are known to be nutritionally essential, while others may be considered to be nonessential. They are usually in minimal quantities in our body and make up only 1% of our mass.
Paramount among these are trace elements such as zinc, copper, manganese, and fluorine. Zinc works as a first responder against infections and thereby improves infection resistance, while balancing the immune response.
Here is the distribution of trace elements in our body:
Element | Weight of Body Mass (mg) | Percentage of Body Mass (%) |
---|---|---|
Fluorine | 2600 mg | 0.00371% |
Zinc | 2300 mg | 0.00328% |
Copper | 72 mg | 0.00010% |
Iodine | 13 mg | 0.00002% |
Manganese | 12 mg | 0.00002% |
Molybdenum | 9.5 mg | 0.00001% |
Selenium | 8 mg | 0.00001% |
Chromium | 6.6 mg | 0.00001% |
Cobalt | 1.5 mg | 0.000002% |
Values are for an average human body weighing 70 kg.
Even though only it’s found in trace quantities, copper is instrumental in forming red blood cells and keeping nerve cells healthy. It also helps form collagen, a crucial part of bones and connective tissue.
Even with constant research and studies performed to thoroughly understand these trace elements’ uses and benefits, scientists and researchers are constantly making new discoveries.
For example, recent research shows that some of these trace elements could be used to cure and fight chronic and debilitating diseases ranging from ischemia to cancer, cardiovascular disease, and hypertension.
Green
The Anthropocene: A New Epoch in the Earth’s History
We visualize Earth’s history through the geological timeline to reveal the planet’s many epochs, including the Anthropocene.

The Anthropocene: A New Epoch in the Earth’s History
Over the course of Earth’s history, there have been dramatic shifts in the landscape, climate, and biodiversity of the planet. And it is all archived underground.
Layers of the planet’s crust carry evidence of pivotal moments that changed the face of the Earth, such as the ice age and asteroid hits. And scientists have recently defined the next major epoch using this geological time scale—the Anthropocene.
In this infographic we dig deep into the Earth’s geological timeline to reveal the planet’s shift from one epoch to another, and the specific events that separate them.
Understanding the Geological Timeline
The Earth’s geological history is divided into many distinct units, from eons to ages. The time span of each varies, since they’re dependent on major events like new species introduction, as well as how they fit into their parent units.
Geochronologic unit | Time span | Example |
---|---|---|
Eon | Several hundred million years to two billion years | Phanerozoic |
Era | Tens to hundreds of millions of years | Cenozoic |
Period | Millions of years to tens of millions of years | Quaternary |
Epoch | Hundreds of thousands of years to tens of millions of years | Holocene |
Age | Thousands of years to millions of years | Meghalayan |
Note: Subepochs (between epochs and ages) have also been ratified for use in 2022, but are not yet clearly defined.
If we were to cut a mountain in half, we could notice layers representing these changing spans of time, marked by differences in chemical composition and accumulated sediment.
Some boundaries are so distinct and so widespread in the geologic record that they are known as “golden spikes.” Golden spikes can be climatic, magnetic, biological, or isotopic (chemical).
Earth’s Geological Timeline Leading Up to the Anthropocene
The Earth has gone through many epochs leading up to the modern Anthropocene.
These include epochs like the Early Devonian, which saw the dawn of the first early shell organisms 400 million years ago, and the three Jurassic epochs, which saw dinosaurs become the dominant terrestrial vertebrates.
Over the last 11,700 years, we have been living in the Holocene epoch, a relatively stable period that enabled human civilization to flourish. But after millennia of human activity, this epoch is quickly making way for the Anthropocene.
Epoch | Its start (MYA = Million Years Ago) |
---|---|
Anthropocene | 70 Years Ago |
Holocene | 0.01 MYA |
Pleistocene | 2.58 MYA |
Pliocene | 5.33 MYA |
Miocene | 23.04 MYA |
Oligocene | 33.90 MYA |
Eocene | 56.00 MYA |
Paleocene | 66.00 MYA |
Cretaceous | 145.0 MYA |
Jurassic | 201.40 MYA |
Triassic | 251.90 MYA |
Lopingian | 259.50 MYA |
Guadalupian | 273.00 MYA |
Cisuralian | 300.00 MYA |
Pennsylvanian | 323.40 MYA |
Mississippian | 359.30 MYA |
Devonian | 419.00 MYA |
Silurian | 422.70 MYA |
Ludlow | 426.70 MYA |
Wenlock | 432.90 MYA |
Llandovery | 443.10 MYA |
Ordovician | 486.90 MYA |
Furongian | 497.00 MYA |
Miaolingian | 521.00 MYA |
Terreneuvian | 538.80 MYA |
The Anthropocene is distinguished by a myriad of imprints on the Earth including the proliferation of plastic particles and a noticeable increase in carbon dioxide levels in sediments.
A New Chapter in Earth’s History
The clearest identified marker of this geological time shift, and the chosen golden spike for the Anthropocene, is radioactive plutonium from nuclear testing in the 1950s.
The best example has been found in the sediment of Crawford Lake in Ontario, Canada. The lake has two distinct layers of water that never intermix, causing falling sediments to settle in distinct layers at its bed over time.
While the International Commission on Stratigraphy announced the naming of the new epoch in July 2023, Crawford Lake is still in the process of getting approved as the site that marks the new epoch. If selected, our planet will officially enter the Crawfordian Age of the Anthropocene.
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