Hair Structure and Function Test Notes
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Questions and Answers

What is the primary function of hair according to the text?

  • To regulate body temperature (correct)
  • To aid in digestion
  • To protect the head from injury
  • To provide color to the body
  • Which part of the hair structure is biologically inactive?

  • Hair shaft (correct)
  • Hair root
  • Hair follicle
  • Hair end
  • What is the function of a hair follicle?

  • To protect the hair root
  • To house the hair root (correct)
  • To grow hair
  • To color the hair
  • What is the difference between vellus hair and terminal hair?

    <p>Thickness and length</p> Signup and view all the answers

    From where does hair actually grow?

    <p>Hair root</p> Signup and view all the answers

    How many follicles do people have on their head on average?

    <p>100,000 to 150,000</p> Signup and view all the answers

    What is the secondary purpose of hair according to the text?

    <p>For adornment</p> Signup and view all the answers

    Which type of hair is typically finer and without a medulla?

    <p>Vellus hair</p> Signup and view all the answers

    In which region of the body can vellus hair typically not be found?

    <p>Palms of hands</p> Signup and view all the answers

    What is the main difference between vellus hair and terminal hair?

    <p>Presence of medulla</p> Signup and view all the answers

    Which type of follicle generally creates wavy to straight hair and is typically seen in European hair types?

    <p>Oval</p> Signup and view all the answers

    Where is the hair root protected within the skin?

    <p>Dermis</p> Signup and view all the answers

    Which structure at the very bottom of the hair root is essential to the health and growth of the hair shaft?

    <p>Hair bulb</p> Signup and view all the answers

    What is the function of the dermal papilla in relation to the hair follicle?

    <p>Encloses the base of the hair bulb</p> Signup and view all the answers

    What is the role of the dermal papilla in hair growth?

    <p>Supplying oxygen-rich blood and keratin cells</p> Signup and view all the answers

    During which phase of the hair growth cycle is the dermal papilla totally inactive?

    <p>Telogen phase</p> Signup and view all the answers

    What do sebaceous glands provide to the hair follicle?

    <p>Natural oils</p> Signup and view all the answers

    What substance do sebaceous glands secrete to add luster and pliability to the hair and scalp?

    <p>Sebum</p> Signup and view all the answers

    What effect does overproduction of sebum by sebaceous glands have on the scalp?

    <p>Oily dandruff</p> Signup and view all the answers

    What is the role of the arrector pili muscle?

    <p>Contracting to make the hair stand up straight</p> Signup and view all the answers

    Which type of hair does not possess arrector pili muscles?

    <p>Eyelash hair</p> Signup and view all the answers

    How does the arrector pili muscle give skin the appearance of 'goose bumps'?

    <p>By contracting and making the hair stand up straight</p> Signup and view all the answers

    What is the primary function of sebum produced by sebaceous glands?

    <p>To provide natural oils for conditioning hair</p> Signup and view all the answers

    Study Notes

    Hair Functions and Structure

    • Primary function of hair is protection, temperature regulation, and sensory perception.
    • The part of the hair structure that is biologically inactive is the hair shaft.
    • Hair follicles serve to anchor each hair in place and facilitate hair growth by nourishing them.

    Types of Hair

    • Vellus hair is fine and lacks a medulla.
    • Terminal hair is coarser, thicker, and typically has a medulla.
    • Vellus hair is usually not found on the palms of hands and soles of feet.

    Hair Growth and Follicles

    • Hair grows from the hair follicle located within the dermis layer of the skin.
    • On average, people have about 100,000 to 150,000 hair follicles on their scalp.
    • Secondary purpose of hair includes providing a sense of touch and aiding in biological signaling.

    Hair Characteristics

    • Straight to wavy hair is produced by oval-shaped follicles, common in European hair.
    • The hair root is protected within the hair follicle.
    • The structure at the very bottom of the hair root crucial for hair health is the hair bulb.

    Dermal Papilla and Hair Growth

    • The dermal papilla supplies nutrients to the hair follicle and regulates hair growth.
    • The dermal papilla is inactive during the telogen (resting) phase of the hair growth cycle.

    Sebaceous Glands Function

    • Sebaceous glands provide oil to the hair follicle, which helps in moisturizing.
    • They secrete sebum, a substance that adds luster and pliability to hair and scalp.
    • Overproduction of sebum can lead to an oily scalp, potentially causing dandruff or other scalp issues.

    Muscle Involvement

    • The arrector pili muscle is responsible for causing hair to stand erect, creating 'goose bumps' when stimulated.
    • Vellus hair does not have arrector pili muscles attached.
    • Arrector pili contraction results in the skin's appearance of goose bumps due to pulling on the hair follicles.

    Sebum's Role

    • The primary function of sebum is to lubricate hair and skin, preventing dryness and providing a barrier against external elements.

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    Description

    Explore the structure and primary functions of hair, including insulation and protection, as well as its secondary function for adornment. Learn about the significance of hair as a symbol of pride, self-care, and esteem. Dive into topics like hair growth, hair typing, and hair care.

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