Certified Surgical Technologist (CST) Practice Exam

Question: 1 / 400

Which elements primarily make up the body's mass?

Oxygen, carbon, magnesium, sodium

Oxygen, potassium, hydrogen, sulfur

Oxygen, carbon, hydrogen, nitrogen

The correct answer highlights the four elements that constitute the majority of the human body's mass. Oxygen, carbon, hydrogen, and nitrogen are essential components of biological macromolecules, which include proteins, nucleic acids, carbohydrates, and lipids.

Oxygen is a key element in water (which makes up a significant portion of the body) and is vital for cellular respiration. Carbon serves as the backbone for all organic molecules, while hydrogen is a key part of water and organic compounds. Nitrogen is crucial for the formation of amino acids and nucleotides, which are necessary for protein synthesis and genetic material, respectively.

In short, these four elements are foundational to life, significantly contributing to the structure and function of cells and tissues in the body.

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Oxygen, carbon, phosphorus, magnesium

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