Hair Flashcards
(34 cards)
What is the hair bulb?
The almost transparent, round structure at the very bottom of the hair root.
The base of the bulb is a hollowed-out or concave ball that fits over and covers the papilla.
What is the dermal papilla?
Small cone-shaped elevations at the end of the hair bulb at the base of the hair follicle.
It plays a crucial role in hair growth by supplying nutrients to the hair follicle.
What is the anagen phase?
The period of hair development when the bulb is moving up through the follicle and new hair is produced.
This phase can last up to seven years.
What occurs during the catagen phase?
The transition or resting stage of hair development where hair cells stop reproducing and moisture is lost.
This phase lasts from one to two weeks.
What happens during the telogen phase?
The bulb is totally separate from the root; new hair cells divide and multiply, creating a new shaft.
This stage lasts two to four months and begins the new cycle.
What are sebaceous glands?
Sac-like structures that provide the follicle with natural oils.
They secrete sebum, which is the substance that moisturizes the hair and scalp.
What is sebum?
The substance secreted by the sebaceous glands (oil glands).
It helps to keep hair and skin moisturized.
What is the function of the arrector pili muscle?
A small, involuntary muscle that causes hair to stand up straight when contracted.
This reaction often occurs due to fear or cold, resulting in the appearance of ‘goose bumps.’
What is a hair follicle?
A deep, angular, pocket-like depression in the scalp that contains the hair root.
It is essential for hair growth and anchoring the hair in place.
Define vellus hair.
Short, fine, white, and downy hair, usually without a medulla.
Vellus hair is found on any area of the body except the palms of hands and soles of feet.
What is terminal hair?
Pigmented hair found on the scalp, arms, legs, nose, and ears.
This hair is coarser than vellus hair and varies in texture, color, and length.
Fill in the blank: The _______ phase is the resting stage of hair development.
catagen
True or False: The anagen phase can last up to seven months.
False
The anagen phase can last up to seven years, not months.
What is the role of hair chemistry in relation to hair and nails?
It involves understanding the composition and properties of hair, nails, and skin.
This knowledge is essential for effective hair and skin care.
What is the primary protein that makes up hair?
Keratin
True or False: Hair is primarily composed of water.
False
Fill in the blank: The hair structure consists of three main parts: the cuticle, the cortex, and the _____ .
medulla
What is the function of the hair follicle?
To anchor each hair into the skin and provide nutrients.
Which part of the hair is responsible for its color?
The cortex
What is the term for the natural pigment found in hair?
Melanin
Multiple choice: What layer of skin contains hair follicles? A) Epidermis B) Dermis C) Hypodermis
B) Dermis
True or False: Nails are made of living cells.
False
What is the visible part of the nail called?
Nail plate
Fill in the blank: The area where the nail grows is called the _____ .
nail matrix
