Hair

Question 1

Hair fibers shape

Answer 1

Rod-like structures composed of tightly fused, dead protein cells filled with hard keratin

Question 2

Color and darkenss of hair is determined by the

Answer 2

Amount and type of melanin produced by the melanocytes that surround the core of the hair shaft

Question 3

Hair follicles

Answer 3

Sacs that hold the root of the hair fibers, shape of the follicle determines whether the hair is straight or curly

Question 4

Why hair grwos

Answer 4

Cells at the base of the follicle divide rapidly and push the old cells upward, as these cells are pushed upward they harden and undergo pigmentation

Question 5

arrector pili

Answer 5

Tiny muscle fibers attached to the hair follicles that cause the hair to stand erect

Question 6

in response to cold or fright, the arrector pili will

Answer 6

Contract, causing raised areas of skin called goose bumps, reduces heat loss through the skin

Question 7

Nails

Answer 7

Unguis, keratin plate that protects the dorsal surface of the last bone of each finger and toe

Question 8

Nail body

Answer 8

Translucent, closely molded to the surface of the underlying tissues, made up of hard, keratinized plates of epidermal cells

Question 9

Nail bed

Answer 9

Joins nail body to the underlying connective tissue, nourished nail
Blood vessels give the nail its pink color

Question 10

Free edge

Answer 10

Portion of the nail not attached to the nail bed, extends beyond the tip of the finger or toe

Question 11

Lunula

Answer 11

Pale, half-moon shaped region at every nail root, generally most easily seen in the thumbnail
Most active area of the nail
Where new kertin cells form

Question 12

Cuticle

Answer 12

Narrow band of epidermis attached to the surface of the nail just in front of the root
Protecting the keratin cells as they form

Question 13

Nail root

Answer 13

Fastens the nail to the finger or toe by fitting into a groove in the skin