Chapter Four Flashcards
Group of similar cells specialized to perform a specific function
Tissues
Covers surfaces , lines , spaces , passageways , form glands
Many subtypes , classified by shape of cells and layering of cells
Epithelial Tissues
Fill internal spaces support other tissues transport materials , store lipids
Connective Tissues
How many types of tissues are there and what are they
Epithelial , connective , muscle and nervous
Where is epithelial tissues
Covers surface of body
Line hollow organs
line body cavities
line tubes of various types ( blood , vessels , ducts )
Used to make glands around the body
What are the 3 primary germ layers tissues are formed form
ectoderm , mesoderm , endoderm
What is the extracellular matrix composed of
Water , protein fibers, dissolved molecules
Composed of one or more layers of closet packed cells between two compartments having different components
EPITHELIUM
True or False there is little to no extracelluar matrix between epithelia cells
True
Some epithelial cells , exocrine glands , are specialized to produce secretion
Secretion
Epithelial cells are stongly bound together by specialized connections in the plasma membranes of their lateral surfaces called
Intracellular junctions
How many junctions are their and what are the names
Tight junctions , adhering junctions , desmosomes and gap junctions
Encircle cells near their apical surface and completely attach each cell to its neighbors
Tight junctions
Form completely around the cells
Adhering junctions
Like a button or snap between adjacent epithelial cells
Desmosome
formed across the intercellular gap between neighboring cells
Gap Junctions
Where is a simple epithelium found
found in areas where stress is minimal and diffusion, filtration, absorption, or secretion is the primary function
( internal lining of the air sacs in the lungs , intestines and blood vessels )
skin, the internal lining of the esophagus, pharynx, or vagina
Stratified epithelium
The simple squamous epithelium that lines the lumen of the blood and lymphatic vessels and the heart and its chambers
Endothelium
Nonciliated simple columnar epithelium often contains microvilli and a scattering of unicellular glands called
Goblet cells
Tiny , ctyoplasmic projections on the apical surface of the cell that increases that surface area for secretion and absorption
Microvilli
What do goblet cells secrete
Mucin
where does nonciliated simple columnar epithelium line
Most of the digestive tracts from the stomach to the anal canal
where does pseudostratified ciliated columnar epithelium line
large portions of the respiratory tract , nasal cavity , part of the throat , voice box, trachea , bronchi
