Hair
Also known as resting phase; the final phase in the hair cycle that lasts until the fully grown hair is shed.
Telogen phase
Abnormal hair loss.
Alopecia
Also known as an end bond; chemical bond that joins amino acids to each other, end-to-end, to form a polypeptide chain.
Peptides bonds
Split ends
Trichoptilosis
Dandruff
Pityriasis
Long, coarse, pigmented hair found on the scalp, legs, arms, and bodies of males and females.
Terminal hair
Total loss of scalp hair.
Alopecia totalis
A weak, physical, cross-link side bond between adjacent polypeptide chains.
Salt bond
Gray hair
Canities
Naturally occurring fungus that is present on all human skin, but is responsible for dandruff when it grows out of control.
Malassezia
Also known as growth phase; phase during which new hair is produced.
Anagen phase
Autoimmune disorder that causes the affected hair follicles to be mistakenly attacked by a person’s own immune system
Alopecia areata
Bonds that cross-link the polypeptide chains together and are responsible for the extreme strength and elasticity of human hair.
Side bonds
Hypertrichosis
Ringworm
Tinea
The brief transition period between the growth and resting phases of a hair follicle. It signals the end of the growth phase.
Catagen phase
Complete loss of body hair.
alopecia universalis
A weak, physical, cross-link side bond that is easily broken by water or heat.
Hydrogen bond
Beaded hair
Monilethrix
Infestation of the hair and scalp with head lice.
Pediculosis capitis
lanugo hair; short, fine, unpigmented, and downy hair that appears on the body, with the exception of the palms of the hands and the soles of the feet.
Vellum hair
Temporary hair loss experienced towards the end and after the pregnancy.
Postpartum alopecia
Strong chemical side bond that joins the sulfur atoms
Disulfide bond
Knotted hair
Dry, sulfur-yellow, cuplike crusts on the scalp in tinea favosa or tinea favus.
Scutula