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Simple Squamos: Function
-Allows passage of materials by diffusion and filtration in sites where protection isn't important.
-Secretes lubricating substances.
Simple Squamos: Location
-Kidey glomeruli, air sacs of lungs, lining of heart, blood vessels, lymphatic vessels, lining of ventral body cavity
Simple Cuboidal: Function
Simple Cuboidal: Location
Kidney tubules, ducts and secretory portions of small glands and ovary surface
Simple Columnar: Description
-Some bear cilia
-Layer may contain goblet cells (mucus secreting)
Simple Columnar: Function
-Secretion of mucus, enzymes, and other substances
-Ciliated type propels mucus
Simple Columnar: Location
-Non ciliatd type: lines most of digestive tract (stomach and anal), gallbladder, and excretory ducts of some glands
-Ciliated type: lines small bronchi, uterine tubes, and some regions of uterus
Psuedostratified Columnar: Description
-May contain mucus secreting cells and bear cilia
-single layer of cells of differing heights
-nuclei seen at different levels
Psuedostratified Columnar: Function
-Secretion (particularly mucus)
-Propulsion of mucus by ciliary action
Psuedostratified Columnar: Location
-Non ciliated: in male's sperm carryign ducts and ducts of large glands
-Ciliated: lines the trachea, most of the upper respiratory tract
Stratified Squamos: Description
-Keratin type=surface cells are dead
-basal cells active in mitosis and produce cells of the more superficial layers
Stratified Squamos: Function
-Protects underlying tissue in areas subject to abrasion
Stratified Squamos: Location
-Nonkeratinized type: forms moist lining of the esophagus, mouth, and vagina
-Keratinized: Forms epidermis of skin
Transitional: Function
-Stretches readily and permits distension of urinary organ by contained urine
Transitional: Location
-Lines ureters, urinary bladder, and part of the urethra
What is Epithelial Tissue?
sheets of cells covering a body surface or lines a body cavity
What does Epithelial Tissue do?
forms boundaries between different environments and nearly all substances received or given off by body must pass through an epithelium
Functions of Epithelial Tissue:
(Please Always Find Examples So Susy-retains)
Protection, Absorbtion, Filtration, Excretion, Secretion, Sensory reception
Apical surface
an upper free surface exposed to the body exterior or the cavity of an internal organ
-Some apical surfaces have this
-Fingerlike extensions of pm
-Increase SA
-Some epithelia have this
-Lining the trachea
-Tiny hairlike projections that propel substances alogn their free surface
Basal Lamina
-Lies adjacent to basal surface
-Thin supporting sheet
-Noncellular, adhesive sheet consisting of glycoproteins
-Acts as a selective filter that determines which moelcules diffusing are allowed to enter epithelium
Tight Junctions
What helps keep PROs in the apical region of the pm from diffusing into the basal region?
Reticular Lamina
Just deep to the basal lamina
-A layer of EC material containing a fine network of collagen PRO fibers that "belongs" to the underlying CT
Basement membrane
-Basal Lamina and Reticular Lamina together form this...
-Reinforces the E sheet, helping it to resist stretching and tearing forces, and defines the E boundary
No blood vessels
Supplied by nerve fibers
Definition of "Gland"
-consists of one or more cells that make and secrete a particular product
Endocrine Glands
-aka ductless glands
-Produce hormones
-Hormones=regulatory chemicals taht they sescrete by exocytosis directly into the EC space. Then hormone enter the blood or lymphatic fluid and travel to specific target organs.
Exocrine Glands
-All secete their products onto the body sufaces (skin) or into body cavities
-include mucous, sweat, oil, and salivary glands, the liver (secretes bile), pancreas (synthesizes dig enzymes) and others
Unicellular Exocrine Glands
-Mucous cells and Goblet Cells
-All produce mucin
Multicellular Exocrine Glands
-More complex.
-have 2 basic parts: an E-derived cut and a secretory unit consisting of secretory cells
Intestinal glands
Simple tubular
Gastric glands
Simple branched tubular
Duodenal glands
Compond tubular
Oil glands
Simple branched alveolar
Mammary glands
Compound Alveolar
Merocrine Glands
-Secrete their products by exocytosis as they are produced
-Pancreas, most sweat glands, and salivary glands
Holocrine Glands
-Accumulate their products w/in them until they rupture
-Sebaceous (oil) glands of the skin
Connective Tissue
-Found everywhere in the body
-Most abudnant and widely distributed
Origin of CT
-Arises from mesencyme (an embryonic tissue)
EC Matric of CT
-Largely nonliving.
-Separates the living cells of the tissue.
-Because of this, CT is able to bear weight, w/stand great tension, and endure abuses
-Made up of the ground substance and fibers
Ground Substance of CT
-The unstructured material that fills the space between the cells and contains the fibers
-Holds large amounts of fuid and functions as a molecular siee, through which nutrients and other dissolved substances can diffuse between blood and capillaries and the cells
Fibers of CT
Collagen Fibers of CT
Strongest and most abundant in CT
Elastic Fibers o fCT
Long, thin fibers. Stretch and recoil. Found in skin, lungs, and blood vessel walls
Reticular Fibers
-Short, fine, collagenous fibers. -Surround small blood vessels and support the soft tissue of organs
Hematopoietic Stem Cell
Undifferentiated blast cell that produces blood cells
Def of Mast Cells
Detect foreign microoganisms and initate local inflammatory responses against them
What's in Mast Cells?
-Heparin, Histamine, and Proteases are found where?
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