a&p lab 3

epithelial & connective tissues, integumentary system

epithelial tissue types

• simple: squamos, cuboidal, coloumnar

• stratified: squamos

• pseudostratified coloumnar

• transitional epithelium

connective tissue types

• CT proper loose : areolar, adipose, reticular

• CT proper dense : regular, irregular, elastic

• cartilage : hyaline, elastic, fibrocartilage

• bone

• blood

exocrine glands

• have ducts

• secrete onto epithelial surfaces

• secretions are non hormonal (mostly h2o or proteins)

• ex : salivary, eccrine, lacrimal, pancreas

endocrine glands

• NO ducts

• secrete into extracellular space ; bloodstream

• secretions: hormones

• ex : adrenal, thyroid, ovaries, testes, pancreas

epidermis

• 4-5 layers of eithelium

• body’s protective outer layer

• surface epithelum of skin

• - above the dermis

dermis (contains papillary and reticular layer)

meaty layer of skin, supports epidermis, contains nerve endings, sebaceous glands, sweat glands, hair follicles, and blood vessels

papillary layer (dermis)

• top dermis layer

• wavy bottom

• made of areolar C.T proper

• functions in temp regulation, sensory, provides nutrients to epidermis, increases surface layer

• contains collagen, fibers, and blood vessels

reticular layer (dermis)

• bottom dermis layer

• made of dense irregular connective tissue proper

• functions in providing structure & elasticity to skin

• contains collagen, elastin fibers, blood vessels, nerve endings, hair follicles, sebaceous glands, sweat glands

hypodermis

• not part of skin

• below dermis

• made of adipose (fatty) tissue

• functions in storing energy, cussioning and protecting, insulating body

eccrine sweat gland

• exocrine glands

• secretes water based products

• functions in temp regulation

• structure: coiled ball with a pore on the

arrector pili muscle

• connects hair follicle to dermis, making hair stand on end

• functions in thermoregulation and sensory responses

• structure: muscle attached to hair follicle

sebaceous (oil) glands

• functions in secreting sebum onto skin

• structure: wart looking thingies attached to hair follicles

root hair plexus

• attached to bottom of hair follicle

• functions in sensory reception - determines if somethings touching hair

pacinian (laminar) corpuscle

• functions in sensing deep pressure stimulus

• structure - spiral shaped

dermal papillae (papillary layer)

• functions in increasing surface area between bottom of epidermis and top of dermis

• more efficiently provides nutrients and oxygen and removes waste

• structure - wavyness of the papillary layer

hair follicle

• structure - hair strand lollll

• function - grow hair and repair skin after wound

simple tissue

has one layer

stratified tissue

has multiple layers

squamos

flat, oval shaped nucleus

cuboidal

cubeish shaped, round nucleus

columnar

tube shaped, oblong nucleus

simple squamos epithelial tissue

• function - allows diffusion, allows filtration, secretes lube into serosae (serous membranes)

• location - lung air sacs, lining of heart, blood and lymphatic vessels, lining of ventral body cavity, kidney glomeruli

pseudostratisfied columnar epithelial tissue

• looks like multiple layers of columnar but isn’t, hence “pseudo”

• function - secretion and propulsion of mucus

• location - nasal cavity, trachea, bronchi, parts of male reproductive system (epididymis, vas deferens, male urethra)

simple cuboidal epithelial tissue

function: secretion and absorption

location - kidney tubules, surface of ovaries, salivary gland ducts

simple columnar

function: absorption and secretion

location: