Which element is not one of the five elements that make up human hair?

Which element is not one of the five elements that make up human hair?

• A. Carbon
• B. Nitrogen
• C. Oxygen
• D. Calcium

Answer: (D)

Hair is primarily made of keratin, a protein whose structure depends on carbon, hydrogen, oxygen, nitrogen, and sulfur. The sulfur-containing amino acids create disulfide bonds that give hair its strength and texture. Calcium, while a mineral important for bones and teeth, isn’t part of the keratin backbone and isn’t a major element in hair’s composition. Trace minerals can be present, but they don’t define the main makeup of hair. So calcium is not one of the five main elements of human hair.

Hair is primarily made of keratin, a protein whose structure depends on carbon, hydrogen, oxygen, nitrogen, and sulfur. The sulfur-containing amino acids create disulfide bonds that give hair its strength and texture. Calcium, while a mineral important for bones and teeth, isn’t part of the keratin backbone and isn’t a major element in hair’s composition. Trace minerals can be present, but they don’t define the main makeup of hair. So calcium is not one of the five main elements of human hair.