WEEK 4.1 Flashcards
Group of cells that usually have a common origin in an embryo and function together to carry out specialized activities
Tissue
Science that deals with the study of tissues
Histology
Physician who examines cells and tissues to help other physicians make accurate diagnoses
Pathologist
Covers body surfaces and lines hollow organs, body cavities, and ducts; forms glands
Epithelial Tissue
Protects and supports the body and its organs.
Connective tissue
Composed of cells specialized for contraction and generation of force
Muscular tissue
Detects changes in a variety of conditions inside and outside the body and responds by generating electrical signals called nerve action potentials
Nervous tissue
The removal of a sample of living tissue for microscopic examination
Biopsy
Contact points between the plasma membranes of tissue cells
Cell junctions
Consist of weblike strands of transmembrane proteins that fuse together the outer surfaces of adjacent plasma membranes to seal off passageways between adjacent cells
Tight Junctions
Contain plaque; a dense layer of proteins on the inside of the plasma membrane that attaches both to membrane proteins and to microfilaments of the cytoskeleton
Adherens junctions
Transmembrane glycoproteins join the cells. Inserts into the plaque from the opposite side of the plasma membrane, partially crosses the intercellular space, and connects to others like it on an adjacent cell
Cadherins
Encircles the cell similar to the way a belt encircles your waist
Adhesion belts
contains plaque and transmembrane glycoproteins; unlike the adherens junction, the plaque of this does not attach to microfilaments
Desmosomes
Resembles desmosomes but do not link adjacent cells
Hemidesmosomes
Transmembrane glycoproteins of the hemidesmosomes
Integrins
At this junction, membrane proteins called connexins form tiny fluid-filled tunnels called connexions that connect neighboring cells
Gap Junction
This surface of the epithelial cell faces the body surface, a body cavity, the lumen of an internal organ, or a tubular duct that receives cell secretions
Apical(free) surface
Face the adjacent cells on either side, may contain tight junctions, adherens junctions, desmosomes, and/or gap junctions
Lateral surface
The opposite of the apical surface; the deepest layer of epithelial cells
Basal surface
Thin extracellular layer that commonly consists of two layers, the basal lamina and reticular lamina
Basement membrane
Closer to and secreted by the epithelial cells. Contains proteins such as laminin and collagen, as well as glycoproteins and proteoglycans
Basal lamina
Closer to the underlying connective tissue and contains proteins such as collagen produced by connective tissue cells called fibroblasts
Reticular lamina
Without vessels. relying on the blood vessels of the adjacent connective tissue to bring nutrients and remove waste
Avascular
Tiny fluid-filled tunnels that connect neighboring cells
Connexons
Forms connexons
Connexins
Forms the outer covering of the skin and some internal organs. Also from inner lining of blood vessels, ducts, body cavities, and the interior or many body systems
Surface epithelium/Covering and lining epithelium
Makes up the secreting portion of glands such as the thyroid gland, adrenal, etc
Glandular epithelium
A single layer of cells that functions in diffusion, osmosis, filtration, secretion, or absorption
Simple epithelium
Production and release of substances such as mucus, sweat, or enzymes
Secretion
The intake of fluids or other substances such as digested food from the intestinal tract
Absorption
Appears to have multiple layers of cells because the cell nuclei lie at different levels and not all cells reach the apical surface
Pseudostratified epithelium
Consists of two or more layers of cells that protect underlying tissues in locations where there is considerable wear and tear
Stratified epithelium
Thin cell shape which allows for the rapid passage of substances through them
Squamous cells
As tall as they are wide and are shaped like cubes or hexagons; may have microvilli at their apical surface and function in either secretion and absorption
Cuboidal cells
Much taller than they are wide and protect underlying tissues. their apical surfaces may have cilia or microvilli, and they often are specialized for secretion and absorption
Columnar cells
Change shape, from squamous to cuboidal and back, as organs such as the urinary bladders stretch to a larger size and then collapse to a smaller size
Transitional cells
Type of simple squamous epithelium which lines the heart, blood vessels, and lymphatic vessels
Endothelium
Type of simple squamous epithelium which forms epithelial layer of serous membranes
Mesothelium
Types of simple epithelium
Simple squamous, simple cuboidal, simple columnar, pseudostratified columnar epithelium
Types of stratified epithelium
Stratified squamous, stratified cuboidal, stratified columnar, transitional epithelium or urothelium
Single layer of flat cells that resembles a tiled floor when viewed from apical surface
Simple squamous epithelium
Single layer of cube-shaped cells
simple cuboidal epithelium
Single layer of nonciliated columnlike cells with oval nuclei near base of cells
Nonciliated simple columnar epith
fingerlike cytoplasmic projections, increase surface area of plasma membrane
Microvilli
modified columnar epithelial cells that secrete mucus at their apical surfaces
Goblet cells
Single layer of ciliated columnlike cells with oval nuclei near base of cells
Ciliated simple columnar epi
Appears to have several layers because the nuclei of the cells are at various levels. Contains cells without cilia and also lacks goblet cells
Nonciliated pseudostratified columnar epi
appears to have several layers because cell nuclei are at various levels. Contains cells that extend to surface and secrete mucus or bear cilia
Ciliated pseudostratified columnar epithelium
has two or more layers of cells; cells in apical layer and several layers deep to it are squamous
Stratified squamous epi
tough, fibrous intracellular protein that helps protect skin and underlying tissues from heat, microbes, and chemicals
Keratin
two or more layers of cells; cells in apical layer are cube-shaped
Stratified cuboidal epi
Basal layers usually consist of shortened, irregularly shaped cells; only apical layer has columnar cells
Stratified columnar epi
Has a variable appearance. In relaxed or unstretched state, looks like stratified cuboidal epithelium, except apical layer cells tend to be large and rounded. As tissue is stretched, cells become flatter, giving the appearance of stratified squamous epithelium
Transitional epithelium(urothelium)
Also called a Pap test or Pap smear; involves collection and microscopic examination of epithelial cells that have been scraped off the apical layer of a tissue
Papanicolaou test
consists of epithelium that secretes substances into ducts, onto a surface, or eventually into the blood in the absence of ducts
Gland
The secretions of this type of gland enter the interstitial fluid and then diffuse into the bloodstream without flowing through a duct.
Endocrine glands
This type of gland secretes its products into ducts that empty onto the surface of a covering and lining epithelium such as the skin surface or the lumen of a hollow organ
Exocrine gland
This type of exocrine gland are single-celled glands
Unicellular glands
Most exocrine glands are this type. Composed of many cells that form a distinctive microscopic structure or macroscopic organ
Multicellular gland
Type of gland where the duct of the gland does not branch
Simple gland
Type of gland where the duct branches
Compound gland
Type of gland with tubular secretory parts
Tubular glands
Type of simple gland with a tubular secretory part that is straight and attaches to a single unbranched duct
Simple tubular