Chapter 7- Hair and Scalp PropertieЁЯСН
In the context of the hair growth cycle, the __________ is the growth phase.
Anagen phase
Which of the following types of hair always contains a medulla?
Beard hair
Which of the following hair colors has the highest density?
Blonde
In the context of side bonds, which of the following is a similarity between hydrogen bonds and salt bonds?
Both result from attracting opposite charges.
The __________ is the fibrous protein layer of the hair.
Cortex
The __________ 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
Identify a difference between fine hair and coarse hair.
Fine hair has the smallest diameter, whereas coarse hair has the largest diameter.
The hair's ability to stretch and return to its original length without breaking is referred to as __________.
Hair elasticity
The __________ is a tube-like structure in the skin or scalp that surrounds the hair root and anchors the hair in the skin.
Hair follicle
Which of the following hair growth patterns involves hair flowing in the same direction as a result of follicles sloping in the same direction?
Hair stream
Hair with __________ has a raised cuticle and is typically damaged, dry, fragile, and brittle.
High porosity
Which of the following statements is true of the hair bulb?
It contains living cells that form the hair strand.
Which of the following is a function of the cortex?
It is responsible for the hair's strength, elasticity, and color.
Which of the following statements is true of the telogen phase of the hair growth cycle?
It is the final hair cycle phase.
Which of the following statements best describes keratinization?
It is the process by which newly formed cells in the hair bulb mature, fill with keratin, move upward, lose their nucleus, and die.
Which of the following statements is true of medium hair?
It is the standard to which other hair textures are compared.
Identify a true statement about the hair cuticle.
It protects the cortex.
Which of the following statements best describes hair porosity?
It refers to the hair's ability to absorb moisture.
In the context of the types of body hair, __________ is short, fine hair that covers a fetus and generally sheds within a few weeks of birth.
Lanugo hair
Hair with __________ has a very healthy cuticle where the scales lie flat.
Low porosity
The __________ is the innermost layer found in coarse hair and beard hair and is also known as the hair's pith or core
Medulla
Which of the following occurs during the anagen phase of the hair growth cycle?
New hair is produced
__________ are attached to the hair follicle and produce an oily substance that lubricates the hair and skin.
Sebaceous glands
Which of the following is a myth about hair?
Shaving and cutting hair makes it grow back darker and coarser.
__________ are bonds that cross-link polypeptide chains and are responsible for the extreme strength and elasticity of human hair.
Side bonds
In the context of the types of body hair, __________is long, pigmented hair on the scalp and body.
Terminal hair
Which of the following phases of the hair growth cycle refers to the brief transition period between the hair follicle's growth and resting phases?
The Catagen phase
Which of the following occurs during the catagen phase of the hair growth cycle?
The follicle canal shrinks and detaches from the dermal papilla.
Which of the following statements is true of cowlicks?
They are usually more noticeable at the crown
The __________ is an involuntary muscle in the dermis that attaches to the hair follicle.
arrector pili muscle
People with dry hair and scalp should __________.
avoid products with high alcohol content
Which of the following is a reason why cosmetologists should have a thorough understanding of the properties of the hair and scalp?
because identifying the differences between common and uncommon hair loss helps them better recommend hair loss treatments to clients
In the context of the COHNS elements that make up human hair, __________ makes up 51 percent of a typical hair strand.
carbon
A __________ is a strong chemical side bond that joins the sulfur atoms of two neighboring cysteine amino acids within the polypeptide chains.
disulfide bond
__________ measures the number of individual hair strands on 1 square inch of scalp.
hair density
__________ is the diameter of an individual hair strand.
hair texture
Which of the following refers to tiny grains of pigment in the cortex that give natural color to the hair?
melanin
Which of the following is the hair's outermost layer?
the hair cuticle
Identify the part of the hair that is located below the surface of the epidermis.
the hair root
People with oily hair and scalp should __________.
thoroughly rinse hair after shampooing
In the context of the hair growth cycle, the __________ is the resting phase.
transition phase
Which of the following refers to the study of the hair, including its diseases and care?
trichology
Cosmetologists should have a thorough understanding of the 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
In the context of the main types of body hair, which of the following is short, fine, unpigmented body hair often referred to as peach fuzz?
vellus hair
The __________ of the hair refers to the amount of movement or shape of the hair strand.
wave pattern
