Concerning hair growth,a. hair falls out of the hair follicle at the end of the growth stage.b. most of the hair on the body grows continuously.c. cutting or plucking the hair increases its growth rate and thickness.d. genetic factors and the hormone testosterone are involved in “patternbaldness.”e. eyebrows have a longer growth stage and resting stage thanscalp hair.

Concerning hair growth,a. hair falls out of the hair follicle at the end of the growth stage.b. most of the hair on the body grows continuously.c. cutting or plucking the hair increases its growth rate and thickness.d. genetic factors and the hormone testosterone are involved in “patternbaldness.”e. eyebrows have a longer growth stage and resting stage thanscalp hair.

Body Structures & Functions Updated

13th Edition

ISBN:9780357191606

Author:Scott

Publisher:Scott

Chapter5: Integumentary System

Section: Chapter Questions

Problem 4RQ

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The cells in a hair follicle that are responsible for forming hair are the a. hair papilla cells. b. matrix cells. c. medullary cells. d. cortex cells.
Hair contains keratinized cells, which are found in thea. cuticle layer.b. cortex.c. medulla.
The direction of hair growth of the eyebrow is a. downward b. towards the midline of the face c. upward and medial d. obliquely upward and outward
The cells in a hair follicle that are responsible for forming hairare thea. papillary cells.b. matrix cells.c. medullary cells.d. cortex cells.
Photoaging is a major factor in the senescence ofa. the integumentary system.b. the eyes.c. the nervous system.d. the skeletal system.e. the cardiovascular system.
Which of the following is a true statement about hair development? (Check all that apply) A) At telogen, dermal fibroblasts secrete BMP4, which inhibits the proliferation of HFSCS. B At telogen, cells are actively proliferating in the inner bulge layer. At telogen, BMP6 and FGF18 from the inner bulge layer promote the apoptosis of HFSCS. At telogen, subcutaneous fat cells secrete BMP2, which inhibits the proliferation of HFSCS. E At telogen-to-anagen transition, fat cells precursors produce PDGF-alpha, which induces the dermal papilla to produce other factors F) At telogen-to-anagen transition, dermal fibroblasts secrete Wnts, which promote the proliferation of HFSCS. G At telogen, stem cells are actively proliferating. H) At anagen, stem cells are all quiescent. At telogen-to-anagen transition, stem cells become activated. At catagen, most of the outer root sheath undergoes apoptosis.
Melanocytes and keratinocytes work together in protecting the skin from UV damage when keratinocytes ________ a.maintain the appropriate pH in order for the melanocyte to synthesize melanin granules. b.provide the melanocyte with nutrients necessary for melanin synthesis. c.maintain the appropriate temperature so the product of the melanocyte will not denature. d.accumulate the melanin granules on their superficial portion, forming a UV-blocking pigment layer.
Because the hair shaft is dead, explain the fallacy of "feeding" the hair as claimed by some cosmetics firms
Common folklore says that if a young man wants to know whether he will become bald, he should look at his mother’s father. Based on the information provided in the following paragraph, is this folklore scientifically accurate? Why are why not? "Although pattern baldness is also seen in women, it is usually expressed weakly as mild thinning of the hair. the trait is stimulated by male sex hormone (androgens), as evidence by the observation that males castrated at an early age rarely become bald. A strong heredity influence on pattern baldness has been recognized and it is believed that the gene is located on X chromosome."
The hair on a 6-year-old’s arms isa. vellus hair.b. terminal hair.c. alopecia.d. lanugo.e. rosacea
List and discuss the three zones along the length of a hair.
The outermost layer of the hair follicle is the ______________. Group of answer choices E. cortex C. hair matrix D. cuticle A. connective tissue root sheath B. epithelial tissue root sheath