Bio II Study Guide 1 Flashcards
outer portion of skin
epidermis
the integumentary system consists of
skin, hair, nails, and glands
skin is thinnest where
eyelids
is the skin waterproof
true
dense irregular connective tissue
dermis
two layers of skin
epidermis & dermis
what are lines of cleavage
collage & fibers in the dermis are lined up, so they tend to lie solely in one direction
what is the hair matrix
cells undergo mitosis & differentiate or specialize to become apart of a region of the hair
loose connective tissue underneath dermis
hypodermis
upper part of dermis is called
papillary layer
the epidermis has its own blood supply
false
thickest part of skin
back & shoulders
from bottom to top name the layers of the epidermis
stratum basale
stratum spinosum
stratum granulosum
stratum lucidum
stratum corneum
cells that produce a class of pigment
melanocytes
class of pigment is called
melanin
two types of melanin pigments
eumelanin
pheomelanin
long extensions of the melanocytes
processes
three concentric layers of hair
medulla
cortex
cuticle
tiny pocket that hair grows from
hair follicle
base of hair root
hair bulb
two types of keratin
hard keratin
soft keratin
layer of skin that contain keratinized cells
stratum granulosum
layer of skin that contains the papillae
dermis
function of sweat glands
to cool the body down
layer of epidermis cells are still alive in
stratum basale
stratum spinosum
function of the sebaceous glands
helps keep the skin & hair moist and conditioned
concentric layer of hair, contains cells of soft keratin
medulla
concentric layer of hair, contains hard keratin
cortex
how does hair follicles or sweat glands help heal bad burns
can help replace the epithelial tissue of the epidermis
kinds of glands that are sweat glands
merocrine
kinds of glands that are sebaceous glands
holocrine
dermis is located
middle
skin is composed of what layers
epidermis
dermis
hair cells with no keratin can be found
matrix
epidermis is located
top
do the secretions of the apocrine sweat gland contain cellular material
yes
part of fingernail between nail fold & plate
cuticle
why do some cuts heal quickly while others that are deeper don’t
Determines how you get cut regarding the lines of cleavage
fingerprints are formed from ridges on
epidermis
