Nails
____ are protective coverings on the ends of the fingers and toes.
nails
True or False: All people have about the same number of melanocytes in their skin.
true
Hair is present on all skin surfaces except the palms, soles, lips, ____, and parts of the external reproductive organs.
nipples
A skin gland that secretes sebum.
sebaceous gland
A disease of the sebaceous glands that produces black heads and pimples.
acne
Each nail consist of a nail plate that overlies a surface of the skin called the ____ ___.
nail bed
___ _____ usually arises in nonpigmented epithelial cells in the deep layer of the epidermis, oe from melanocytes.
skin cancer
Genes determine hair color by directing the type and amount of _____ that epidermal melanocytes produce.
pigment
Exocrine gland in skin that secretes a mixture of water, salt, urea, and other bodily substances.
sweat glands
Hair loss, usually sudden.
alopecia?
The whitish, thickend, half-moon-shaped region at the base of the nail plate.
lunula?
Skin color is due largely to ____.
melanin
how many layers does our hair have
three layers
A sweat gland that maintains body temperature.
eccrine gland?
Fungus (Tinea pedis) infection usually in the skin of the toes and soles.
athlete's foot
The ______ grows the slowest; the middle nail grows the fastest.
thumbnail
The skin includes two distinct layers the ____ and the ____.
epidermis and the dermis
Each hair develops from a group of _____ ___ at the base of a tubelike depression called a hair follicle.
epidermal cells
A type of gland whose secretions have parts of secretory cells.
apocrine gland?
Congenital blemish or spot on the skin, visible at birth or soon after.
birthmark
The keratin of nails is harder than the produced by the ________ _____ ______.
epidermal stratum corneum
Beneath the dermis is loose connective tissue, predominantly adipose tissue, that binds the skin to underlying organs forming the __________ ____.
subcutaneous layer
which muscle moves If someone is emotionally upset or very cold
arrector pili muscle
The average square inch (6.45 square centimeters) of skin holds ____ sweat glands.
around 650 sweat glands
Bacterial infection (furuncle) of the skin, produced when bacteria enter a hair follicle.
a boil