Flashcards in Chapter 4: Tissue: the Living Fabric Deck (181)
Groups of cells that work together to perform a specific function
4 types of tissues
1. Composed almost entirely of cells
2. Form continuous sheets held together by tight junctions and desmosomes
3. Supported by connective tissue - reticular and basal laminae (basement membrane).
4. Avascular but innervated - contains no blood vessels but supplied by nerve fibers
5. Regenerative - rapidly replaces lost cells by cell division
The basement membrane is like
double sided sticky tape
How permeable is epithelial tissue to water? why?
Waterproof like a pool liner. It's a continuous sheet. There are no spaced between the cells which makes it waterproof.
Which layer of skin is the oldest?
The surface. The deepest layers of skin are the newest.
Naming tissues - 1st name is based on...
number of layers. Simple, stratified
Tissues that are classified as simple are used for
filtering and diffusion
Tissues that are classified as stratified are
places that shed. surface of skin, mouth, etc
Naming tissues - last name is based on...
shape. squamous (squatty), cuboidal (cube-like), columnar (column-like).
Epithelia: Simple Squamous - Structure
Single layer of flattened cells with disc-shaped nuclei and sparse cytoplasm
Epithelia: Simple Squamous - Functions
1. Diffusion and filtration.
2. Provide a slick, friction-reducing lining in lymphatic and cardiovascular systems.
Epithelia: Simple Squamous - Locations
Present in the kidney glomeruli, lining of heart, blood vessels, lymphatic vessels, and serosae
Epithelia: Simple Cuboidal - Structure
Single layer of cube-like cells with large, spherical central nuclei.
Epithelia: Simple Cuboidal - Function
secretion and absorption
Epithelia: Simple Cuboidal - Location
Present in kidney tubules, ducts and secretory portions of small glands, and ovary surface.
Epithelia: Simple Columnar - Structure
Single layer of tall cells with oval nuclei; many contain cilia. Goblet cells are often found in this layer
Epithelia: Simple Columnar - Function
absorption and secretion
Epithelia: Simple Columnar - Location
1, Nonciliated type line digestive tract and gallbladder.
2, Ciliated type line small bronchi, uterine tubes, and some regions of the uterus
What to cilia do?
they help move substances through internal passageways
Epithelia: Pseudostratified Columnar - Structure
Single layer of cells with different heights; some do not reach the free surface. Nuclei are seen at different layers
Epithelia: Pseudostratified Columnar - Function
secretion and propulsion of mucus
Epithelia: Pseudostratified Columnar - Location
Present in the male sperm-carrying ducts (nonciliated) and trachea (ciliated)
Epithelia: Stratified Squamous - Structure
Thick membrane composed of several layers of flat-cells
Epithelia: Stratified Squamous - Function
protection of underlying areas subjected to abrasion
Epithelia: Stratified Squamous - Location
Forms the external part of the skin’s epidermis (keratinized cells),
and linings of the esophagus, mouth, and vagina (nonkeratinized cells).
Epithelia: Stratified Cuboidal - Structure
Typically two, cubed shaped cell layers thick
Epithelia: Stratified Cuboidal - Function
Epithelia: Stratified Cuboidal - Location
some sweat and mammary glands