integumentary system (lab) Flashcards
what kinds of tissues compose the skin
epidermis, dermis
hypodermis function
anchors skin to underlying organs
shock absorber
insulate deeper tissues
another name for hypodermis
subcutaneous layer
what is the outer layer of skin named
epidermis
is epidermis vascular or avascular
avascular
what cell produces keratin
keratinocytes
what are the epidermis layers
stratum basale
stratum spinosum
stratum granulosum
stratum lucidum
stratum corneum
describe stratum spinosum
cells becoming flatter and more keratinized
describe stratum basale
deepest layer of epidermis
cells undergoing mitosis
daughter cells pushed upward
describe stratum granulosum
cells flattened
ONLY in thick, hairless skin of palms and soles of feet
describe stratum corneum
outermost layer
dead cells filled with keratin
define dermis
connective tissue
underlies the epidermis
what are the layers of the dermis
papillary layer
reticular layer
describe the papillary layer
upper dermal region
creates highs and low points on skin
describe the reticular layer
deepest skin layer
contains blood vessels, sweat/oil glands, deep pressure receptors
what is the bottom layer of skin
hypodermis
hypodermis function
energy storage
connect dermis to muscles and bones
insulate and protect body
what happens to the hypodermis as you age
decreases in size, and skin sags
define hair shaft
thin, flexible cylinder of nonliving keratinized epithelial cells
define hair bulb
base of hair follicle
builds the hair shaft
blood vessels in hair bulb nourish cells and bulb
define hair follicle
pore that surrounds root and strand of hair
exists in top two layers of skin
hair papilla
contains the blood supply for the hair
define hair root
part of hair that is located in the skin
define arrector pili muscle
tiny muscle that attaches to the base of the hair follicle and dermal tissue
causes hair to stand up straight
