physio final 1
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what are the layers of the integumentary system?
hypodermis (separates the deeper tissues from dermis, which has the connective tissue, epidermis is the skin exposed to the outside layer
what are the layers in the epidermis?
stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corenum
what is special about the strattum basale?
- has epidermal ridges, which increase SA for nutrient uptake in the dermis
- stem cells that continues to divide
what is the layer of the epidermis that have stopped dividing and makes keratin?
why does the stratum corneum cells lose in sheets?
remains tightly connected by desosomes
what are the observed differences in skin color a reflection of?
reflect the levels of melanin produced by the melanocyte
what is sunlight used for?
converts into vitamin D, converted by kidneys to calcitriol, which is essential for the absorption of calcium
what is the layer in the dermis that supports the epidermis?
papillary layer; it contains a deeper reticular layer which collagens and fibers
where are the osteocytes located?
in small pockets called lacunae, between narrow sheets of calcified matrix, lamellae
what are the basic units of a compact bone?
osteon, where osteocytes are arranged in concentric layers around a central canal
how are spongy bone different from compact bone?
lamellae form rods or plates called trabeculae
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