Hair And Nail Properties Flashcards
Cosmetologist should have a thorough understanding of properties of the hair and scalp because…
Understanding how the hair structure is formed and how hairstyling and chemical services alter hair, will lead to safer smarter services
What is the study of hair called including its diseases and care?
Trichology
why should cosmetologist have a thorough understanding of the properties of hair and scalp.
Because I identifying the differences between common and uncommon hair loss helps them better recommend hair loss treatment to clients
What is the heart of hair that is located below the surface of the epidermis?
The hair root
What is the tube like structure in the skin or scalp that surrounds the hair and includes the hair in the skin?
Hair follicle
Which of the following statements is true of the hair bulb?
It contains living cells that form the hair strand
What is a cone shaped elevation at the base of the hair bulb and contains blood vessels that supply nutrients that allow the hair to grow?
Dermal papilla
What is the involuntary muscle in the dermis that attaches to the hair follicle?
Arrector Pili muscle
What are attached to the hair follicle and produce an oily substance that lubricates the hair and skin?
Sebaceous glands
What is the hairs outermost layer?
The hair cuticle
What is the function of the hair cuticle?
It protects the cortex
What is the fibrous protein layer of the hair?
Cortex
What is the function of the cortex?
It is responsible for the hair, strength, elasticity, and color
What is the innermost layer found in course hair and beard hair and is also known as the hair pith or core?
Medulla
What type of hair always contains a medulla
Beard hair
What is keratinization?
It’s the process by which newly formed cells in the hair bulb mature, fill with keratin, move upward, lose their nucleus ,and die
What element makes up 51% of of typical hair strands
Carbon
Which bonds that cross-link poly peptide chains and a responsible for the extreme strength and the elasticity of human hair
Side bonds
What is a similarity between hydrogen bonds and salt bonds?
Both result from attracting opposite charges
Which bond is a strong chemical side bond that joins the sulfur atoms of two neighboring cystein amino acids with the polypeptide chain
Disulfide bond
What is the tiny grains of pigment in the cortex that gives natural color to the hair?
Melanin
What refers to the amount of movement or shape of the hair strand?
Wave pattern
What describes the diameter of an individual hair strand?
Hair texture
What best describes hair porosity
It refers to the hairs ability to absorb moisture
What kind of hair has a very healthy cuticle where the scales lie flat
Low porosity
What kind of hair has a raised cuticle and it typically damaged, dry, fragile, and brittle
High porosity
What is the hairs ability to stretch and return to its original length without breaking referred to as
Hair elasticity
What describes hair flowing in the same direction as a result of follicle sloping in the same direction
Hair stream
What is true of medium hair?
It is the standard to which other hair textures are compared
What is a difference between fine hair and course hair?
Fine hair has the smallest diameter whereas course hair has the largest diameter
What measures the number of individual hair strands on one square inch of scalp
Hair density
Which hair color has the highest density?
Blonde
What is true of cowlicks
They are usually more noticeable at the crown
People with dry hair and scalp should
Avoid products with high alcohol content
People with oily hair and scalp should
Thoroughly rinse hair after shampooing
What is the short fine hair that covers a fetus and generally sheds within a few weeks of birth called
Lanugo hair
What is short fine unpigmented body hair often referred to as peach fuzz called
Vellus hair
What is long pigmented hair on the scalp and body called?
Terminal hair
What is the growth phase?
Anagen phase
What occurs during the anagen phase of the hair growth cycle?
New hair is produced
What cycle is a brief transitionary period between the hair, follicles growth and resting phases
Catagen phase
What occurs during the catagen phase of the hair growth cycle?
The follicle canal shrinks and detaches from the dermal papilla
Which phase is the resting phase?
Telogen phase
What is true of the telogen phase of the hair growth cycle?
It is the final hair cycle phase
What is a myth about hair?
Shaving and cutting hair makes it grow back darker and Corser
