anatomy 5,6,9,10
stratum lucidum
thin, clear layer
stratum granulosum
three to give layers of keratinocytes
true or false: one of thee functions of the subcutaneous layers is thermal insulation
true
true or false: the subcutaneous layer consists of areolar and adipose connective tissue
true
true or false: the subcutaneous layer is avascular
true
functions of the integument system
-protects the body from wear and is renewable, -protects from UV rays, -promotes vitamin D3 formation, -resists water loss, -a microorganism barrier, -excretes waste, -temperature control, -receives external stimuli from the environment, -stores some chemical compounds such as vitamin D
stratum corneum
20-30 layers of dead keratinocytes
the papillary layer of the dermis contains _____ connective tissue and dermal papillae
areolar
which of the following types of connective tissue comprise the dermis
areolar, dense irregular
commonly occurs in the skin during aging
collagen fibers in the dermis decrease in number, reduced activity of skin stem cells
hair papilla
contains blood vessels and nerves
stratum spinosum
contains keratinocytes and dendritic cells
stratum basal
deepest layer of epidermis
epidermal _______ accomplish their immune function by their phagocytic activity , which initiates an immune response against invaders
dendritic cells
layers of epidermis in order
dermis, stratum basal, stratum spinosum, stratum granulosum, stratum lucidum, stratum, corneum
the dermal papillae interlock with deep projections of the epidermis called
epidermal ridges
layers of skin in order
epidermis, dermis, hypodermis
true or false: differences in skin pigmentation is due to a difference in the number of melanocytes each individual has
false
which of the following is not found in thick skin
hair follicles
The most abundant cells of the epidermis.
keratinocytes
hair shaft
portion of hair beyond the skin surface
which. of the following is most likely to cause stretch marks
pregnancy
hair root
protion of hair within the follicle e
after a stem cells divides in the epidermal stratum basal, the resulting daughter cell enters the stratum
spinosum
the integument consists of the epidermis, which is composed of ______, and the dermis, which is composed of______connective tissue
stratified squamous epithelium, dense irregular and areolar
hair bulb
swelling where the hair originates
select the function of the integument in which sweat glands are involved
temperature regulation