integumentary system Flashcards
6 functions of integumentary system
Protection Body temperature Cutaneous sensation Metabolic functions Blood reservoir Excretion (limited role)
stratified squamous epithelial cells, not vascularized
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epidermis
(irregular) dense connective tissue; vascularized
dermis
new epidermis every 25 to 45 days
keratinocytes
absorbs UV light and prevents DNA in cells’ nuclei from being damaged
melanin
ingest foreign substances and initiate immune response
dendritic cells
sensory receptors for touch
Tactile Merkel Cells
5 layers of the epidermis
stratum corneum stratum granulosum stratum spinosum stratum lucidum stratum basale
stratum granulosum function
Keratinization of cells begins
stratum spinosum
Dendritic cells most abundant
dermis is made up of what?
connective tissue proper
nerves and blood and lymphatic vessels
2 layers of dermis:
papillary
reticular
dermis papillary layer is made of
Loose areolar connective tissue
dermis reticular layer
Dense irregular connective tissue
dermal papillae
Fingerprints
Dense irregular connective tissue
Dermal folds near joints accommodate movement
flexure lines
all humans have same number of melanocytes
different kind and amount
epidermis is transparent in
caucasians
Blood escaped from vessels and clotted beneath the skin
hematoma
Pale, fine body hair of infants and adult women
vellus
Coarser, longer
terminal
hair Keratinization is complete (dead cells)
shaft
Keratinization is ongoing (not quite dead)
root
Large cells and air spaces; only layer with soft keratin (like skin); absent in fine hairs
medulla (hair)
