The tiny grains of pigment in the cortex that provide natural color to the hair are composed of:
Melanin is the pigment responsible for natural hair color.
Melanin is produced in the hair follicles and determines the color of hair, skin, and eyes. It exists in various forms, primarily eumelanin and pheomelanin, which contribute to the wide range of natural hair colors.
Keratin is a fibrous protein that forms the structure of hair, nails, and the outer layer of skin. While keratin contributes to the strength and texture of hair, it does not provide color. Therefore, keratin is not responsible for the pigmentation of hair.
Melanin is the correct answer, as it is the specific pigment produced by melanocytes in the hair follicles. This pigment is responsible for the various shades of hair color, from blonde to black, and its composition influences the intensity and tone of the hair.
Side bonds refer to the weak interactions between polypeptide chains within the hair's keratin structure. These bonds play a role in the overall strength and resilience of hair but do not contribute to pigmentation. Thus, they are unrelated to the color of hair.
Polypeptides are chains of amino acids that make up proteins, including keratin in hair. While they are essential for forming the structure of hair, they do not provide color themselves. Therefore, polypeptides do not relate to the pigmentation aspect of hair.
In summary, melanin is the key pigment that imparts natural color to hair, while keratin, side bonds, and polypeptides contribute to the structural integrity and physical properties of hair but do not influence its color. Understanding the role of melanin enhances our knowledge of hair biology and the factors affecting hair color variations.
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