Tissues/Histology Flashcards
what are the 4 basic tissue types
Epithelial
connective
muscular
nervous
What is epithelial tissue used for
lining/covering and secretory or glandualry tissue
what is connective tissue used for
support and nutrititon for other tissue
what is muscular tissue used for
contracts to produce movement
what is nervous tissue used for
integration and control
What are the 3 primary germ layers
ectoderm
mesoderm
endoderm
what comes from the ectoderm layer of embryonic cell
epithelium, specifically the epidermis and nervous system
what comes from the mesoderm layer of the embryonic cell
endothelium
mesothelium
muscle
connective tissue
epithelium
what come from the endoderm layer of the embryonic cell
epithelium and mucosae
Why is genome like a circuit breaker box
genes switch on and off to differentiate cells
cancer can turn some genes back on
what is epithelial tissue defined by
cell shape
nucleus
and where nucleus is located
what do epithelial cells look like
packed tightly toghether
apical and basal surfaces/layers
regenerate rapidly at basal layer
does epithelial tissue have blood vessels
no it is not vascularized
what three junctions does ET have
tight
gap
desmosomes
where does ET get nutrients
CT
what are the cell shapes in ET
squamous
cuboidal
columnar
what is simple ET
one layer of cells
what is stratified ET
2 or more layers of cells
what do the cells look like in simple squamous (top view)
flat cells with centrallly located nucleus
functions of simple squamous ET
diffusion of gasses in lung alveoli
secretion of serous fluid/covers organs
filtration in the kidneys
smooth inner blood vessel wall
(Lining, gas diffusion, filtration)
functions of simple cuboidal
secretion of hormones
reabsorption in tubules in the kidneys
description of simple cuboidal ET
single layer of cube like cells
big round, central nuclei
may have microvilli
where is simple cuboidal ET found
wall of small glandular ducts
wall of kidney tubules
surface of the ovaries
functions of simple ciliated columnar
movement of particles
description of simple columnar ET
column shaped cells in single layer
nuclei elliptical or round located in the bottom 3rd of the cell
goblet cells common
may have cilia or microvilli
functions of simple non-ciliated columnar
GI tract for absorption and secretion
Where are goblet cells found
in simple columnar or psuedostratified columnar ET
why dont goblet cells stain
they have a high water and lipid content
what do goblet cells do
secrete mucus
where is pseudostratified ciliated columnar found
lining of upper respiratory tract
lining of trachea
description of pseudostratified columnar ET
mostly columnar cells at different heights
nuceli sit at bottom levels
goblet cells common
where is pseudostratified non-ciliated columnar found
large glands and parts of the male urethra
functions of psuedostratified columnar ET
secretion of mucus and propulsion of mucus if ciliated
where is non keratinized stratified squamous ET found
esophagus
mouth
vagina
description of stratified squamous ET
many layers of cells
cells near basement mebrane are cuboidal to columnar in shape
cells flatter going towards the apical surface
where is keratinized stratified squamous ET found
skin epidermis
never inside of body
What do transitional ET cells look like
surface cells look domed or squamous when stretched
basal cells look cuboidal or columnar
where is transitional ET found
lined bladder for stretchability
what is really the only function of transitional ET
allows for distension of organ as urine collects
where is stratified cuboidal found
ovarian follicles
pancreas
salivary glands
sweat glands
generally anywhere that does a lot of secretion
where is stratified columnar found
parotid gland duct (big salivary gland)
part of male urethra
what do cells look like in stratified columnar
basal cells are cuboidal or columnar
surface cells are columnar
what are the two types of glandular epithelia
exocrine and endocrine
Where is exocrine glandular epithelia found in
ducts and glands
what are the components that make up an exocrine gland (though not limited to)
single cell, simple duct, goblet cells
what is endocrine glandular epithelia for? What makes it different from exocrine?
not ducts, only for hormone secretion
what are the 3 modes of secretion
merocrine
holocrine
apocrine
what is merocrine mode of secretion
secrete by exocytosis as it’s produced
most glands are this
what are some glands that use merocrine mode of secretion
pancreas
sweat glands
salivary glands
what is holocrine mode of secretion
releases when secretory cell ruptures
what mode of secretion do sebaceous glands use
holocrine
what is apocrine mode of secretion
accumulates product at one edge until it pinches off along with a bit of cytoplasm
do human apocrine glands use apocrine mode of secretion
no
what are the three components of CT
specialized cells
protein fibers
ground substance