Hair follicles
Contents
- 1 All of the following are true of the hair follicles except
- 2 Long eyelashes in patients with acquired immunodeficiency syndrome is due to
- 3 Telogen effluvium is the result of early release from anagen that can be induced by all except
- 4 Patients receiving chemotherapy often have hair loss because
- 5 Male pattern baldness is due to
- 6 Red hair is characterized by
- 7 In short
- 8 Hair color
- 9 Premature graying
- 10 Pregnancy
All of the following are true of the hair follicles except
A. Infundibulum segment is the upper portion of the follicle, isthmus is below the opening of sebaceous duct
B. Melanocytes are found in the dermal papillae
C. Follicular matrix has the highest mitotic rate of any organ in the body
D. Sebaceous glands are holocrine glands closely associated with hair follicles
Long eyelashes in patients with acquired immunodeficiency syndrome is due to
A. Short telogen phase
B. Short catagen
C. Long anagen phase
D. Long catagen phase
Telogen effluvium is the result of early release from anagen that can be induced by all except
A. Febrile illness
B. Surgery
C. Weight loss
D. Pregnancy
Patients receiving chemotherapy often have hair loss because
A. Tapered fracture of hair follicle
B. Shedding of anagen hair
C. Early release from anagen
D. Synchronous termination of telogen and catagen hair
Male pattern baldness is due to
A. Hair follicle miniaturization
B. High level of androgens
C. Length of telogen is shortened
D. Gradual loss of vellus hair
Red hair is characterized by
A. Decreased number of melanocytes
B. Larger melanosomes
C. Apoptosis of hair follicle melanocytes
D. Spherical melanosomes
In short
Hair color
Hair color depends on the degree of melanization and distribution of melanosomes within the hair shaft.
Premature graying
Premature graying is related to exhaustion of the melanocyte stem cell pool.
Pregnancy
Pregnancy is typically accompanied by retention of an increased number of scalp hairs in anagen, as well as a prolongation of telogen.
