Where are tissues connected?
Intercellular junctions
Tissues
layers of groups of cells with a common function
three types of cellular junctions
tight junction, gap junction, desmesomes
functions of tight junctions
- membranes of adjacent cells fuse
- cells that form sheet-like layers
location of tight junctions
lining of digestive tract
location gap junctions
digestive system, muscular system
location of desmesomes
skin cells, heart muscles, muscles of digestive tract
functions of gap junctions
- connect cells by linking the cytoplasm of adjacent cells
- allows ions, sugars, nucleotides, and amino acids to pass between cells
function of desmesomes
forms a reinforced structural unit
histology
study of tissues
where does epithelial tissue line?
- organs and body surface
- cavities, hollow organs
how are epithelial tissues classified?
- cell shape
- number of cell layers
epithelial tissues lack____
blood vessels
how do epithelial tissues divide?
readily
organization of epithelial tissues
tightly packed
types of glandular secretions
merocrine glands
apporine glands
holorrine glands
examples of merrocrine glands
salivary glands, pancreas glands, sweat glands
examples of holocrine glands
sebaceous glands
examples of apocrine glands
mammary glands
function of holocrine glands
secretes products
difference between serous fluid and mucus
serous fluid-water
mucus-thick
what does simple squamous line?
air sacs, blood vessels, lymphatic cystem
simple squamous= ___ layer of __ cells
simple, flat
how do substances pass through in simple squamous?
easily
what does simple cuboidal line?
ovaries, glands, kidney tubules
function of simple cuboidal
secretes and absorbs
shape and layers of simple cuboidal
single layer, cube shaped cells
layer of simple squamous
single layer
lumen
hollow channel
what does simple columnar line?
uterus, stomach, intestines
shape and layers of simple columnar
single layer, elongated cells
simple columnar posses ____ and _____
cilia, microvilli
kind of tissue that have goblet cells?
simple columnar
function of goblet cells
secrete mucus
location of nuclei in simple columnar
near basement
shape and layers of pseudostratified columnar
single layer, elongated cells
where do psuedostratified columnar ephothelium line?
respiratory system
example of unicellular gland
mucus secreting goblet cell
example of simple tubular gland
intestinal gland of small intestine
example of simple coiled tubular gland
sweat glands
example of simple branches tubular gland
gastric glands
example of simple branched alveolar gland
sebaceous gland
simple tubular gland
straight tubelike gland that opens directly onto surface
simple coiled tubular gland
long, coiled, tubelike, long duct
simple branched tubular gland
branched, tubelike gland, duct short or absent
simple branched alveolar gland
secretory portions of gland expand into saclike compartments along duct
example of compound tubular gland
bulbourethral glands of male
example of compound alveolar gland
mammary glands
compound tubular gland
secretory portions are coiled tubules, usually branched
compound alveolar gland
secretory portions are irregularly branched tubules with numerous saclike outgrowths
stratified squamous epithelium is named for cells forming _____ layers
outermost
stratified squamous epithelium produce ____
keratin
why is keratin produced?
older cells are pushed outward
does stratified squamous epithelium have many layers?
yes
stratified squamous epithelium=thick tissue
stratified squamous epithelium=thick tissue
stratified squamous epithelium lines…
oral cavity
vagina
anal canal
stratified cuboidal epithelium lines…
mammary glands, sweat glands, salivary glands, pancreas
stratified cuboidal epithelium forms lining of
ovarian follicles and seminiferous tubules(male)
stratified cuboidal epithelium composed of….
two or three layers of cuboidal cells
stratified columnar epithelium composed of
several layers of elongated cell
stratified columnar epithelium found in
male urethra, exocrine glands
transitional epithelium lines
urinary bladder, ureters
transitional epithelium prevents
contents from the urinary passageways from diffusing out
glandular epithelium intended for
cells to secrete substances
exocrine glands
secrete into ducts
endocrine glands
secrete into tissue fluid or blood
four types of tissues
epithelial, connective, muscles, nervous
location of epithelial tissues
cover body surface, cover and line internal organs, compose glands
location of connective tissues
widely distributed throughout body
location of muscle tissues
attached to bones, in the walls of hollow internal organs, heart
location of nervous tissues
brain, spinal cord, nerves
characteristics of nervous tissues
cells communicate with each other and other body parts
characteristics of muscle tissues
able to contract in response to specific stimuli
characteristics of connective tissues
good blood supply, cells are farther apart than epithelial cells
characteristics of epithelial tissues
cells are tightly packed, cells readily divide