Please enable JavaScript.
Coggle requires JavaScript to display documents.
Integumentary System By Nicole Hennen Sec. 31 (General Functions including…
Integumentary System By Nicole Hennen Sec. 31
Components
:
Hair
composed of dead cells filled with hard keratin
Nails
composed of hard keratin
Skin
considered an organ due to having more than 1 tissue type. Contains all 4 tissues types
Exocrine Glands
sweat gland (two types, eccrine and apocrine) and sebaceous glands(produce oil)
General Functions including hypodermis
Protection
waterproof barrier from outer elements (water, dirt, UV radiation)
temperature regulation
thermoregulation- blood vessels & sweat glands assist in lower or rising body temp.
excretion
minor role: eliminates water & electrolytes; wastes
production of vitamin D
produced with help of UV radiation. Is needed to help body absorb calcium for strong bones and teeth
sensory reception
sensory receptor, sensitive to touch
Hypodermis made primarily of adipose; provides insulation(fat storage), connection to deeper tissue(loose connection to muscle)
Cells of the epidermis
Keratinocytes
cells have abundant keratin (tough protein) from basal layer all the way to apical layer
Stem cells
located in the stratum basale; make new cells pushing up the dead cells.
Melanocytes
pigment producing cells; produce melanin, more melanin=darker skin
Tactile epithelial cells (Merkel cell)
Dendritic cells
member of the immune system; mobile, stretches between cells in stratum spinosum. (patrols to keep harm out)
Layers of epidermis
Stratum basale
Stem cells are abundant, melanocytes and tactile epithelial cells found in this layer
Stratum spinosum
5-20 layers thick, superior to stratum basale. Cells have "spines" from fibers connected to desmosomes. Dendritic cells wander through.
Stratum granulosum
granules that produce a water proofing glycolipid that secrets from the cell
Stratum lucidum
flat layer of keratinocytes; present in thick skin
Stratum corneum
dead cells; losing most of their organelles, filled with keratin