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28 March, 12:13

Each of the following statements concerning hair is true except

A. scalp hairs grow constantly throughout life.

B. the cortex of the hair is composed of hard keratin.

C. the medulla is the soft core of the hair.

D. club hair is hair that has ceased growing.

E. terminal hairs are heavy and more darkly pigmented than other types of hair.

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  1. 28 March, 13:09
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    Answer: A. scalp hairs grow constantly throughout life.

    Explanation:

    Hair is a squamous keratinized epithelium which is consist of multi-layered flat cells. Hair are made up of protein called "keratin".

    The statement "scalp hairs grow constantly throughout life" is false because at a particular age or due to several factors scalp hairs stop growing.

    Scalp hair growth rate depends on three main factors including sex (female hair grows faster than male), age (hair growth slows with age), and ethnicity (Asian hair grows slower than Caucasian hair).

    Scalp hair growth stops because of follicle devitalization when the hair length become two or three feet.

    Hence, the correct answer is A. "scalp hairs grow constantly throughout life".
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