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BiologyBiology
7 January, 05:45

A human head hair is best characterized by: a. The absence of a cortex. b. Its scale pattern. c. A medulla that is more than 1/2 the overall diameter of the hair shaft. d. A medulla that is absent or is less than 1/3 the overall diameter of the hair shaft.

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  1. 7 January, 07:33
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    d. A medulla that is absent or is less than 1/3 the overall diameter of the hair shaft is the correct answer.

    Explanation:

    A human head hair is best characterized by a medulla that is absent or is less than 1/3 the overall diameter of the hair shaft. Hair is a protein thread that develops from the follicles located within the dermis. Hair present on the head acts as a source of insulation, protect from the ultraviolet radiation and dust.

    Hair consists of two different parts

    Follicle Hair shaft

    hair shaft consists:

    cortex: located between hair cuticle and medulla cuticle cells: are the outermost portion of the hair shaft. medulla: is the inner layer of the hair.
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Home » Biology » A human head hair is best characterized by: a. The absence of a cortex. b. Its scale pattern. c. A medulla that is more than 1/2 the overall diameter of the hair shaft. d.
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