Tissues Tissues Groups of cells performing Groups of cells performing similar functions similar functions Grouped by cells and matrix Grouped by cells and matrix Structure determines function and Structure determines function and function determines location function determines location Four types Four types Histology - study of tissues Histology - study of tissues
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Tissues Groups of cells performing similar functions Groups of cells performing similar functions Grouped by cells and matrix Grouped by cells and matrix.
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TissuesTissues Groups of cells performing similar Groups of cells performing similar
functionsfunctions Grouped by cells and matrixGrouped by cells and matrix Structure determines function and Structure determines function and
function determines locationfunction determines location Four typesFour types Histology - study of tissuesHistology - study of tissues
secrete sweat –secrete sweat – regulates body temperature - evaporationregulates body temperature - evaporation Eliminates some waste productsEliminates some waste products Two types of sweat glands:Two types of sweat glands:
skin of axilla, pubic region, skin of axilla, pubic region, pigmented areas of the bodypigmented areas of the body
Secrete thickened sweat that Secrete thickened sweat that promotes the growth of bacteriapromotes the growth of bacteria
Active during periods of Active during periods of emotional stressemotional stress
Eccrine Sweat GlandsEccrine Sweat GlandsFYIFYI
Distributed throughout the bodyDistributed throughout the body Secrete watery sweat to lower Secrete watery sweat to lower
temptemp Density can be as high as 3000 per Density can be as high as 3000 per
square inch in palms of the hands square inch in palms of the hands
Sebaceous GlandsSebaceous Glands
Oil glands next to hair folliclesOil glands next to hair follicles Secrete oily substance – sebum (FYI: mixture of Secrete oily substance – sebum (FYI: mixture of
fats, cholesterol, protein and inorganic saltsfats, cholesterol, protein and inorganic salts Keeps hair from drying out & becoming brittleKeeps hair from drying out & becoming brittle Keeps skin soft & pliableKeeps skin soft & pliable Inhibits growth of certain bacteriaInhibits growth of certain bacteria
Hair (Pili)Hair (Pili) Grows from Grows from
epidermisepidermis function is function is
protectionprotection– guards the scalp guards the scalp
– ears and nostrils ears and nostrils keep out foreign keep out foreign objectsobjects
Helps regulate Helps regulate body temperaturebody temperature
Touch receptors Touch receptors with hair follicleswith hair follicles
NailsNails
Plates of tightly packed, hard, keratinized Plates of tightly packed, hard, keratinized cells of the epidermiscells of the epidermis
covering over the dorsal ends of digitscovering over the dorsal ends of digits Provides protectionProvides protection Helps to grasp and manipulate small objectsHelps to grasp and manipulate small objects
Portions of NailsPortions of Nails
Nail Body - portion of nail visible FYI:Nail Body - portion of nail visible FYI:– Free Edge - extends beyond the digitsFree Edge - extends beyond the digits– Root - hidden in proximal nail grooveRoot - hidden in proximal nail groove– Lunula - whitish semilunar area at proximal end Lunula - whitish semilunar area at proximal end
of the nail bodyof the nail body EponychiumEponychium - Cuticle - Cuticle Nail Matrix - epithelium at proximal end FYI:Nail Matrix - epithelium at proximal end FYI:
– mitosis and nail growth from this areamitosis and nail growth from this area– grows at a rate of about 1 mm per week grows at a rate of about 1 mm per week
THE END!!THE END!!
Decubitous UlcersDecubitous Ulcers
bed sores - pressure soresbed sores - pressure sores lesion caused by prolonged lesion caused by prolonged
pressure resulting in blood pressure resulting in blood deficiency to a tissue overlying a deficiency to a tissue overlying a bony projectionbony projection
seen most frequently in individuals seen most frequently in individuals bedridden for prolonged periods of bedridden for prolonged periods of timetime
Nail StructureNail Structure
Hair ColorHair Color
Due to amount of melanin in the Due to amount of melanin in the cells of the hair shaftcells of the hair shaft
Can accumulate air bubbles in the Can accumulate air bubbles in the hair shaft which causes hair to turn hair shaft which causes hair to turn gray or whitegray or white