Podcast
Questions and Answers
Which portion of the hair would display living cells when looking through a microscope?
Which portion of the hair would display living cells when looking through a microscope?
Hair bulb
What is the density of hair?
What is the density of hair?
The number of active hair follicles per square inch on the scalp
What does porosity in hair refer to?
What does porosity in hair refer to?
Ability for hair to absorb moisture, liquids or chemicals
What is elasticity in hair?
What is elasticity in hair?
What is located at the bottom of the follicle and supplies nourishment to the germinal matrix?
What is located at the bottom of the follicle and supplies nourishment to the germinal matrix?
Under what circumstances will hair that has been pulled out from the roots grow back?
Under what circumstances will hair that has been pulled out from the roots grow back?
What is formed when sebum produced by the oil glands mixes with the body's perspiration?
What is formed when sebum produced by the oil glands mixes with the body's perspiration?
The hair follicle that produces tightly curled hair is typically what shape?
The hair follicle that produces tightly curled hair is typically what shape?
Hair that is 90% cortex and 10% cuticle is considered to be more what compared to hair that is 60% cortex and 40% cuticle?
Hair that is 90% cortex and 10% cuticle is considered to be more what compared to hair that is 60% cortex and 40% cuticle?
What causes gray hair?
What causes gray hair?
What is long, thick pigmented hair such as scalp and eyebrow hair referred to as?
What is long, thick pigmented hair such as scalp and eyebrow hair referred to as?
What can traction alopecia be caused by?
What can traction alopecia be caused by?
Wet hair is able to be stretched to what percent of its length?
Wet hair is able to be stretched to what percent of its length?
What condition exists when alternating bands of gray and dark hair occur?
What condition exists when alternating bands of gray and dark hair occur?
What scalp disease might be present if dry, yellow, encrusted areas on the scalp are noticed along with a peculiar odor?
What scalp disease might be present if dry, yellow, encrusted areas on the scalp are noticed along with a peculiar odor?
What hair problem may be caused by an inherited defect in the hair's keratin protein structure?
What hair problem may be caused by an inherited defect in the hair's keratin protein structure?
What are small cracks starting in the cuticle and splitting the hair entirely known as?
What are small cracks starting in the cuticle and splitting the hair entirely known as?
What hair is replaced with terminal hair around the time of puberty?
What hair is replaced with terminal hair around the time of puberty?
Which agency's review and approval must products claiming hair regrowth or hair loss prevention receive?
Which agency's review and approval must products claiming hair regrowth or hair loss prevention receive?
The degree of coarseness or fineness in the hair fiber is referred to as what?
The degree of coarseness or fineness in the hair fiber is referred to as what?
The cuticle layers protect which part of the hair strand?
The cuticle layers protect which part of the hair strand?
In humid regions, hair may need what type of conditioning?
In humid regions, hair may need what type of conditioning?
What can result from various actions on an abraded cuticle, except which one?
What can result from various actions on an abraded cuticle, except which one?
What condition involves a gradual conversion from terminal hair follicles to vellus-like follicles?
What condition involves a gradual conversion from terminal hair follicles to vellus-like follicles?
Which hair color generally has the highest number of hair per square inch on the head?
Which hair color generally has the highest number of hair per square inch on the head?
What is short, fine, non-pigmented hair that covers most of the body called?
What is short, fine, non-pigmented hair that covers most of the body called?
What disorder refers to thick, crusty patches of red irritated scalp?
What disorder refers to thick, crusty patches of red irritated scalp?
Which term refers to the total loss of hair on the scalp?
Which term refers to the total loss of hair on the scalp?
What can excessive chemical hair lightening or friction from backcombing cause?
What can excessive chemical hair lightening or friction from backcombing cause?
What is excessive matting of the hair called?
What is excessive matting of the hair called?
What is the premature shedding of hair in the resting stage, which can result from childbirth, shock, drug intake or fever?
What is the premature shedding of hair in the resting stage, which can result from childbirth, shock, drug intake or fever?
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Study Notes
Hair Structure and Function
- Living cells are found in the hair bulb, visible under a microscope.
- Hair density measures the number of active hair follicles per square inch on the scalp.
- Porosity refers to hair's ability to absorb moisture, liquids, or chemicals.
- Elasticity is the capacity of hair to stretch and return to its original shape without breaking.
Hair Growth and Anatomy
- The papilla, located at the bottom of the follicle, nourishes the germinal matrix.
- Hair pulled from the roots can regrow unless the papilla is destroyed.
- Sebum from oil glands mixes with perspiration to form the protective acid mantle.
Hair Type and Texture
- Tightly curled hair is produced by elliptical hair follicles.
- Hair with a higher cortex percentage (90%) is more elastic compared to hair with lower cortex (60%).
- Gray hair results from reduced melanin pigment in the cortex.
Hair Classification
- Long, thick, pigmented hair (e.g., scalp and eyebrow hair) is called terminal hair.
- Traction alopecia may develop from tight hairstyles like cornrows.
- Wet hair can stretch up to 40%-50% of its original length.
Hair Conditions and Disorders
- Ringed hair presents as alternating bands of gray and dark hair.
- Tinea favosa is characterized by dry, yellow, encrusted areas on the scalp with an unusual odor.
- Trichorrhexis nodosa is an inherited defect in hair's keratin structure.
- Small cracks in the cuticle leading to hair split are known as trichoptilosis.
Hair Development
- Around puberty, short, fine, non-pigmented hair is replaced with terminal hair.
- The FDA must review and approve products claiming to regrow or prevent hair loss.
- Hair texture describes the coarseness or fineness of hair fiber.
Hair Care and Maintenance
- Cuticle layers protect the cortex of the hair strand.
- In humid environments, hair may require protein conditioning.
- Abraded cuticles are not caused by shampooing.
Hair Loss and Thinning
- Androgenetic alopecia involves a gradual conversion from terminal hair follicles to vellus-like follicles.
- Blond hair generally has the highest density of hair per square inch.
- Vellus hair refers to short, fine, non-pigmented body hair.
- Psoriasis describes thick, crusty patches of irritated scalp.
- Alopecia areata totalis denotes total loss of hair on the scalp.
Hair Damage
- Excessive lightening or friction from backcombing may lead to pilica polonica, characterized by excessive matting of hair.
- Telogen effluvium refers to premature shedding of hair during the resting phase due to stressors like childbirth or illness.
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