Chapter Four: Tissues Flashcards
Hierarchy of body structures
Atoms-Molecules-Cells-Tissues-Organs-Organ systems-Organism
a group of atoms, molecules, and organelles working together
cells
a group of similar cells working together
tissue
a group of different tissues working together
organ
Four types of tissues
- Epithelial tissue
- Connective tissue
- Muscle tissue
- Neural tissue
covers exposed surfaces, lines internal passageways and forms glands
epithelial tissue
Fills internal spaces, supports other tissues, transports materials and stores energy
Connective tissue
specialized for concentration and the skeletal muscle, heart muscle and walls of hollow organs
muscle tissue
carries electrical signals from one part of the body to another
neural tissue
layers of cells covering internal or external surfaces
epithelia
structures that produce secretions
glands
interconnections of cells
cell junctions
base of the epithelium is bound to the underlying connective tissue
basement membrane
contains no blood vessels
avascular
continuous replacement of cells
regeneration
presence of structural and functional differences between exposed and attached surfaces
polarity
epithelial cells that are exposed to an internal or external environment
apical surfaces
epithelial cells that include the base where the cell attaches to underlying epithelial cells or deeper tissues. Also connects neighboring cells
basolateral surfaces
transmembrane proteins which bind to each other and to extracellular materials
cell adhesion molecules
type of intercellular connections that form bonds with other cells or extracellular materials
cell junctions
three types of cell junctions
- tight junctions
- gap junctions
- desmosomes
type of cell junction that lies between two plasma membranes and prevents the passage of water and solutes
tight junctions
encircles the cell and binds them to their neighbors and attaches to the terminal web
adhesion belt
type of cell junction that allows for rapid communication and are held together by channel proteins that allow ions to pass
gap junctions
type of cell junction that is dense [intercellular cement] which connects the cells giving it strength
desomosomes
type of desomosome that ties the cells together and allow for the bending and twisting of the cells
spot desomosomes
type of desomosome that attaches the cells to the basal lamina
hemidesomosomes
epithelia are replaced by the division of [stem cells]
germinative cells
Types of epithelia based on shape
- Squamous epithelia
- Cuboidal epithelia
- Columnar epithelia
types of epithelia based on layers
- simple epithelia
2. stratified epithelia
type of squamous epithelia that is the most delicate and used in absorption and diffusion
simple squamous epithelium
simple squamous epithelium that lines the body cavities
mesothelium
simple squamous epithelium that lines the heart and blood vessels
endothelium
type of squamous epithelia that occurs on areas of lots of stress and protects against attacks. Keratin adds strength and water resistance
stratified squamous epithelium
Type of cuboidal epithelia that is used for secretion and absorption
simple cuboidal epithelium
type of cuboidal epithelia that occurs in sweat ducts and mammary ducts
stratified cuboidal epithelia
type of epithelium that tolerates repeated cycle of stretching and recoiling and returns to its previous shape without damage
transitional epithelium
type of columnar epithelia that is used in absorption and secretion
simple columnar epithelium
type of columnar epithelia that is used in cilia movement
pseudostratified columnar epithelium
type of columnar epithelia that is used in protection
stratified columnar epithelium
type of epithelia that is specialized in secretion
grandular epithelium
Type of cell that releases hormones into the interstitial fluid without ducts
endocrine glands
type of cell that produces secretions onto the epithelial surfaces through ducts
exocrine glands
type of gland that produces watery secretions
serous glands
type of gland that secretes mucins
mucous glands
type of gland that produces both watery secretions and mucins
mixed exocrine glands
the only unicellular exocrine glands
mucous [goblet] cells