Milady Esthetics State Board Practice Test 2025 - Free Esthetics Exam Practice Questions and Study Guide

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What is the thick, club-shaped structure that forms the lower part of the hair root?

Hair shaft

Hair bulb

The thick, club-shaped structure that forms the lower part of the hair root is known as the hair bulb. The hair bulb is crucial in the hair growth process as it contains specialized cells that are responsible for producing hair. It sits at the base of the hair follicle and is surrounded by the dermal papilla, which provides essential nutrients and signals necessary for hair growth and regulation.

Understanding the function of the hair bulb is significant in esthetics, as it connects to hair health and growth phases, which can be influential in various treatments and procedures in skincare and haircare. The hair shaft refers to the visible part of the hair, which extends above the scalp, while the hair follicle is the entire structure that houses the hair, including the bulb. The medulla is the innermost layer of the hair shaft and is not involved in the formation of the root structure itself.

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Hair follicle

Medulla

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