Chapter 4 - Tissues Flashcards
group of specialized cells and the extracellular substances surrounding them
Tissue
microscopic study of tissue
Histology
Covers and protects surfaces, both outside and inside the body
Epithelial tissue
Mostly composed of cells. Very little extracellular matrix between them. True or False
True
Most epithelial tissues have one free, or ________ where cells are exposed and not attached to other cells.
apical surface
At the base of the cells is the _________ basement membrane, a specialized type of extracellular material secreted by epithelial and connective tissue cells.
basal surface
___________ helps attach the epithelial cells to the underlying tissues.
Basement membrane
all gases and nutrients carried in the blood must reach the epithelium by diffusing from blood vessels across the basement membrane. True or False
True
a single layer of cells, each cell extending from the basement membrane to the free surface
Simple epithelium
more than one layer of cells, only the basal layer attaches the deepest layer to the base
Stratified epithelium
a special type of simple epithelium; appears to be stratified but is not.
Pseudostratified columnar epithelium
cells are flat or scalelike
Squamous
cube-shaped (about as wide as they are tall)
Cuboidal
tall and thin; taller than they are wider
Columnar
In the lungs, they allow for gas exchange
CHOICES:
Simple squamous epithelium, Simple cuboidal epithelium, Simple columnar epithelium, Pseudostratified columnar epithelium, Transitional epithelium, Stratified squamous epithelium, Stratified columnar epithelium, Stratified cuboidal epithelium
Simple squamous epithelium
have a greater secretory capacity than simple squamous epithelial cells
CHOICES:
Simple squamous epithelium, Simple cuboidal epithelium, Simple columnar epithelium, Pseudostratified columnar epithelium, Transitional epithelium, Stratified squamous epithelium, Stratified columnar epithelium, Stratified cuboidal epithelium
Simple cuboidal epithelium
In the small intestine, they produce and secretes mucus and digestive enzymes
Simple columnar epithelium
secretes mucus, which covers its free surface
CHOICES:
Simple squamous epithelium, Simple cuboidal epithelium, Simple columnar epithelium, Pseudostratified columnar epithelium, Transitional epithelium, Stratified squamous epithelium, Stratified columnar epithelium, Stratified cuboidal epithelium
Pseudostratified columnar epithelium
Cilia in the airways move the mucus and accumulated debris toward the throat, where it is swallowed.
CHOICES:
Simple squamous epithelium, Simple cuboidal epithelium, Simple columnar epithelium, Pseudostratified columnar epithelium, Transitional epithelium, Stratified squamous epithelium, Stratified columnar epithelium, Stratified cuboidal epithelium
Pseudostratified columnar epithelium
forms a thick epithelium because it consists of several layers of cells
CHOICES:
Simple squamous epithelium, Simple cuboidal epithelium, Simple columnar epithelium, Pseudostratified columnar epithelium, Transitional epithelium, Stratified squamous epithelium, Stratified columnar epithelium, Stratified cuboidal epithelium
Stratified squamous epithelium
This epithelial type is relatively rare and is found in sweat gland ducts, ovarian follicular cells, and the salivary glands.
CHOICES:
Simple squamous epithelium, Simple cuboidal epithelium, Simple columnar epithelium, Pseudostratified columnar epithelium, Transitional epithelium, Stratified squamous epithelium, Stratified columnar epithelium, Stratified cuboidal epithelium
Stratified cuboidal epithelium
consists of more than one layer of epithelium cells, but only the surface cells are columnar
CHOICES:
Simple squamous epithelium, Simple cuboidal epithelium, Simple columnar epithelium, Pseudostratified columnar epithelium, Transitional epithelium, Stratified squamous epithelium, Stratified columnar epithelium, Stratified cuboidal epithelium
Stratified columnar epithelium
a special type of stratified epithelium that can be greatly stretched
CHOICES:
Simple squamous epithelium, Simple cuboidal epithelium, Simple columnar epithelium, Pseudostratified columnar epithelium, Transitional epithelium, Stratified squamous epithelium, Stratified columnar epithelium, Stratified cuboidal epithelium
Transitional epithelium
the large size of these cells enables them to perform complex functions
CHOICES:
Simple squamous epithelium, Simple cuboidal epithelium, Simple columnar epithelium, Pseudostratified columnar epithelium, Transitional epithelium, Stratified squamous epithelium, Stratified columnar epithelium, Stratified cuboidal epithelium
Simple columnar epithelium
In the kidneys, they help filter wastes from the blood while keeping blood cells inside the blood vessels
CHOICES:
Simple squamous epithelium, Simple cuboidal epithelium, Simple columnar epithelium, Pseudostratified columnar epithelium, Transitional epithelium, Stratified squamous epithelium, Stratified columnar epithelium, Stratified cuboidal epithelium
Simple squamous epithelium
Prevents abrasion between organs in the pericardial, pleural, and peritoneal cavities
CHOICES:
Simple squamous epithelium, Simple cuboidal epithelium, Simple columnar epithelium, Pseudostratified columnar epithelium, Transitional epithelium, Stratified squamous epithelium, Stratified columnar epithelium, Stratified cuboidal epithelium
Simple squamous epithelium
As the newly formed cells fare pushed to the surface, they become flat and thin; As the cells flatten, the cytoplasm of the epithelial cells is replaced by a protein called ________ , and the cells die
keratin
clear, thick fluid that protects the lining of the intestine
Mucus
forms the outer layer of the skin
keratinized squamous epithelium
could be seen in the mouth and provides protection against abrasion and acts as a mechanical barrier, preventing microorganisms from entering the body.
nonkeratinized (moist) stratified squamous epithelium
The thick layer of cells provides protection against abrasion and forms a barrier that prevents microorganisms and toxic chemicals from entering the body.
keratinized squamous epithelium
keratin reduces the loss of water from the body. True or False
True
Simple epithelium is found in organs that primarily function to defecate the materials. True or False
False - move
The movement of materials through a stratified epithelium is hindered by its many layers, the reason it is well adapted for protective function. True or False
True
Cells are normally cuboidal or columnar when the function is diffusion. True or False
False - flat and thin
Cells with the major function of secretion or absorption are usually cuboidal or columnar. True or False
True
lung cancer most often results from changes in epithelial cells in the lung passageways of smokers. True or False
True
The lining of blood vessels is a specialized type of simple squamous epithelium called ______
endothelium
mechanical links that bind cells together
CHOICES:
Tight junctions, Gap junctions, Adhesion belt, Hemidesmosomes, Desmosomes, Cell connections, Smooth free surface
Desmosomes
reduces friction as material moves across it
CHOICES:
Tight junctions, Gap junctions, Adhesion belt, Hemidesmosomes, Desmosomes, Cell connections, Smooth free surface
Smooth free surface
Cells have structures that hold one cell to another or the base membrane
CHOICES:
Tight junctions, Gap junctions, Adhesion belt, Hemidesmosomes, Desmosomes, Cell connections, Smooth free surface
Cell connections
anchor cells to the basement membrane; many are found in epithelia subjected to stress
CHOICES:
Tight junctions, Gap junctions, Adhesion belt, Hemidesmosomes, Desmosomes, Cell connections, Smooth free surface
Hemidesmosomes
bind adjacent cells together and form permeability barriers
CHOICES:
Tight junctions, Gap junctions, Adhesion belt, Hemidesmosomes, Desmosomes, Cell connections, Smooth free surface
Tight junctions
Modified desmosomes
CHOICES:
Tight junctions, Gap junctions, Adhesion belt, Hemidesmosomes, Desmosomes, Cell connections, Smooth free surface
Hemidesmosomes
prevent the passage of materials between epithelial cells because they completely surround each cell
CHOICES:
Tight junctions, Gap junctions, Adhesion belt, Hemidesmosomes, Desmosomes, Cell connections, Smooth free surface
Tight junctions
found below the tight junction; act as a weak glue that holds cells together
CHOICES:
Tight junctions, Gap junctions, Adhesion belt, Hemidesmosomes, Desmosomes, Cell connections, Smooth free surface
Adhesion belt
mall channels that allow small molecules and ions to pass from one epithelial cell to an adjacent one
CHOICES:
Tight junctions, Gap junctions, Adhesion belt, Hemidesmosomes, Desmosomes, Cell connections, Smooth free surface
Gap junctions
found in the lining of the intestines and in most other simple epithelia
CHOICES:
Tight junctions, Gap junctions, Adhesion belt, Hemidesmosomes, Desmosomes, Cell connections, Smooth free surface
Tight junctions
Most epithelial cells are connected to one another by _________
CHOICES:
Tight junctions, Gap junctions, Adhesion belt, Hemidesmosomes, Desmosomes, Cell connections, Smooth free surface
Gap junctions
secretory organs
Glands
glands with ducts
Exocrine gland
Composed primarily of epithelium, with a supporting network of connective tissue
Glands
glands separated from the epithelium of their origin and have no ducts
Endocrine gland
glands and ducts are lined with epithelium
Exocrine gland
have extensive blood vessels
Endocrine gland
The cellular product of endocrine glands are _______, which is secreted in the bloodstream and carried throughout the body
hormones
Most exocrine glands are composed of many cells and are called __________
multicellular glands
goblet cells secretes ________
mucus
Multicellular exocrine glands can be classified according to the structure of their ducts and secretory regions. True or False
True
have a single and nonbranched duct
Simple glands
_______ have multiple, branched ducts
Compound glands
If there are multiple secretory regions that branch off the duct, then the gland is called branched. True or False
True
For compound glands, the shape of the secretory regions further defines the gland. True or False
False - both simple and compound
Glands with secretory regions shaped as tubules (small tubes)
tubular
Glands with secretory regions shaped in saclike structures
acinar or alveolar
glands that could be straight or coiled.
tubular
combination of tubular and acinar glands
tubuloacinar or tubuloalveolar
the most common type of secretion
CHOICES:
merocrine secretion, holocrine secretion, apocrine secretion
merocrine secretion