MIDTERM 01 - Tissues Flashcards
Group of cells with similar structure and function
Tissue
Study of tissues
Histology
A physician who examines cells and tissue
Pathologist
4 types of tissues
Connective tissue, Epithelial tissue, Muscular tissue, Nervous tissue
5 types of cell junctions
Tight junctions, Desmosomes, Adherens, Hemidesmosomes, Gap junctions
Binds adjacent cells together
Tight junctions
Are mechanical links that bind cells
Desmosomes/cadherins
Help epithelial surfaces resist separation during contractile activities
Adherens/cadherins
Bind cells to the basement membrane
Hemidesmosomes/integrins
Small channels that allow molecules to pass
Gap junctions/connexins
Covers body surfaces and lines hollow organs, body cavities, and ducts
Epithelial tissue
3 classifications of epithelium based on cell layers
Simple epithelium, Stratified epithelium, Pseudostratified epithelium
Consists of only a single layer of cells
Simple epithelium
Consists of more than one layer of epithelial cells
Stratified epithelium
Appears to be 2 or more layers of cells, some are tall and others are short
Pseudostratified epithelium
4 classifications of epithelium based on idealized shapes
Squamous, Cuboidal, Columnar, Transitional
Are flat or scalelike; rapid passage of substances
Squamous
Are cube shaped; may have microvilli
Cuboidal
Are tall than thin; cell tends to be taller than they are wide
Columnar
Changes shape, from squamous to cuboidal and back
Transitional
Is a single layer of flat cells that resembles a tiled floor when viewed from apical surface
Simple squamous epithelium
A single layer of cube shaped cells; some cells have microvilli or cilia
Simple cuboidal epithelium
Single layer of tall, narrow cells; some cells have cilia or microvilli
Simple columnar epithelium
Single layer of cells; some cells are tall and thin and reach the free surface, and others do not
Pseudostratified columnar epithelium
Several layers of cells that are cuboidal in the basal layer and progressively flattened toward the surface
Stratified squamous epithelium
Consists of more than one layer of cuboidal epithelial cells
Stratified cuboidal epithelium
Consists of more than one layer of epithelial cells, but only the surface cells are columnar
Stratified columnar epithelium
Stratified cells that appear cuboidal when the organ or tube is not stretched and squamous when the organ or tube is stretched by fluid
Transitional epithelium