What Are the Six Most Abundant Elements That Occur in Living Organisms?

••• heebyj/iStock/GettyImages

All matter in the universe is composed of a number of chemical elements. These chemical building blocks are also the basis for all living organisms on Earth. While living organisms contain a number of different elements, some elements are found in greater abundance in living organisms. These elements are oxygen, carbon, hydrogen, nitrogen, calcium and phosphorus.

TL;DR (Too Long; Didn't Read)

Living organisms often contain trace amounts of several elements, but the most abundant ones are oxygen, carbon, hydrogen, nitrogen, calcium and phosphorus.

Oxygen

Oxygen is the most abundant element contained within living organisms, composing about 65% of the human body. Oxygen is also the most abundant element in the Earth's crust, and in the air that is essential for most life on Earth. Oxygen's presence in the body is largely in the form of water, which is used to produce the energy within the body needed to sustain life.

Carbon

Carbon forms the basis for all life on Earth; indeed, life forms on Earth are referred to as carbon-based life forms, emphasizing the importance of this element for life. Carbon atoms readily bond to other atomic elements, such as oxygen and nitrogen. Since carbon can so readily bond to other elements, long chains of bonds can form and provide the physical and chemical structure needed for the complex processes and structures that occur within living organisms, such as structural proteins and genetic information in the form of nucleic acids.

Hydrogen

Hydrogen is the simplest element, as its atom contains only a single proton and a single neutron. As a result of this simplicity, hydrogen readily bonds with other elements, making it an important component for the formation of living organisms. Hydrogen is the other element (along with oxygen) which forms water, a crucial component for most life forms on Earth. Hydrogen is also a byproduct in many biological reactions, including photosynthesis and metabolism.

Nitrogen

Nitrogen is one of the most abundant elements on Earth, composing approximately 80% of the air on Earth. Nitrogen is an important element in the development of plant life, as compounds containing these elements are readily absorbed and used by plants. Nitrogen is also an important component of many proteins and deoxyribonucleic acids (DNA), which is crucial for genetic material to be passed on to subsequent generations of life.

Sulfur

Sulfur is a major component of two essential amino acids used by living organisms: cysteine and methionine. These amino acids, like all amino acids, are crucial for the construction of proteins that are used for structural stability and repair of living organisms. For example, the structural integrity of hair and feathers can be attributed to these amino acids. Sulfur is also used as a source of energy and is metabolized by some species of bacteria and other lower life forms.

Phosphorus

Phosphorus is used in the formation of phospholipids, a type of molecule that is a major component of the cell membrane of all living cells. Without this cell membrane, cells would not be able to develop and would not have the structural stability to form in the first place. This protective layer of phospholipids holds all the internal components of cells in place, allowing for the processes that maintain the life of the cell to take place. The phospholipid layer also protects the cell by keeping any unwanted or potentially destructive materials outside of the cell.

Related Articles

What Are the Six Main Elements in Living Organisms?
What Elements Make Up Glucose?
Which Elements Are Found in Living Organisms?
What Gases Make Up the Air We Breathe?
What Are the Three Common Categories of Lipids?
Facts About Lipids
Nitrogen Gas Vs. Carbon Dioxide
What Are the 3 Most Common Elements in Human Bodies?
What Are Three Main Elements Comprising the Structure...
Percentage of Nitrogen in the Air
What Are the Functions of Carbohydrates in Plants and...
Number of Protons in an Uncharged Atom
Ecological Importance of Algae
How Does Hydrogen Enter Our Body?
Elements of Nucleic Acids
What Elements Make Up the Air We Breathe?
What Are Some Items Made of Carbon?
What Are the Atoms That Make Up Lipids?
What is a Diatomic Molecule?
How to Make a Silicon Atom Project