Elements in the Human Body

Study Notes

Most Abundant Elements in the Human Body

Approximately 97% of human body weight is composed of four primary elements: Oxygen, Carbon, Hydrogen, and Nitrogen.
These elements are essential for a variety of biological functions and structures within the body.

Oxygen

Comprises 65% of human body mass, making it the most abundant element.
Crucial for growth, reproduction, and energy conversion from food.
Supports the functioning of vital organs, including the lungs and heart, as all organs require oxygen.

Carbon

Accounts for around 18% of body mass and serves as a fundamental building block for proteins, carbohydrates, and fats.
Energy is primarily derived from breaking carbon bonds in carbohydrates and proteins, making carbon vital for metabolic processes.

Hydrogen

Represents about 9.5% of body weight and is predominantly found in water.
Plays a critical role in all bodily fluids, facilitating the transport and elimination of toxins and waste.

Nitrogen

Comprises 3.2% of body mass and is a vital component of amino acids, which are essential for protein synthesis.
Nitrogen intake occurs through the consumption of both plant and animal products, underscoring its importance in diet.

Description

This quiz explores the most abundant elements in the human body, focusing on the contributions of oxygen, carbon, hydrogen, and nitrogen. According to organic chemist Steven D. Townsend, these elements collectively account for nearly 97% of body weight. Test your knowledge on the significance of these essential elements.