Flashcards in Tissue Organization Deck (56):
Tissue that lines, covers, and protects
Epithelial Tissue Characteristics
Basement membrane ----
High Regenerative capacity
Epithelial Tissue: Cellularity
High cell number, and tightly packed together
Epithelial Tissue: Polarity
Have sides. Apical surface, and basal surface
Epithelial Tissue: Basement membrane
non-living substance. Produced by epithelial cells acne connect tissue below it. Both of these tissues share this tissue
Epithelial Tissue: Avascularity
No blood supply of their own. Receive nutrients and gases from underlying CT
Epithelial Tissue: Extensive innervation
High proportion of sensory receptors: to detect changes in a given variable.
Epithelial Tissue: High regenerative Capacity
Continually under go Mitosis
Epithelial Tissue can be classified by
Cell shape or amount of layers
Squamous cell shape
Fried egg shape
About as tall as wide with centrally located, spherical nucleus
Taller than wide. Ovoid, basally located nucleus
Functions of Epithelial Tissue
Physical protection (Protect internal and external structures by providing barrier)-----
Selective Permeability (Controls what enters and exits the body)-----
Secretion (Produce and release chemicals)-----
Sensation (Rich nerve fibers sense changes in variables and communicate this information to the control center)
F: Thinnest possible barrier, minimal stress.
allows rapid diffusion and filtration
Location: Avioli in lungs, lining blood and lymph vessels (endothelium), making up serous membrane (mesothelium)
F: Absorption and secretion
Location: Kidney tubules, filtering blood (Reabsorption of nutrients, ions, and water from blood) and producing urine. Thyroid Gland, secreting thyroid hormones. covers the surface of the ovary
Simple Columnar Nonciliated
-Contain Goblet Cells (unicellular glands that secrete mucin)
-For: Absorption and secretion
- Location: Digestive track from stomach to anus, most have microvilli (Creating brush border)
Simple columnar ciliated
- Contain goblet cells
-For: moving stuff along tissue surface. covered in mucus
- Location: Larger Broncials, lining uterine tubes (helps move oocyte from ovary to uterus)
Pseudostratified columnar epithelium
Appears like multiple layers. contains goblet cells in ciliated
Location: -ciliated form lines larger airways of respiratory tract, including nasal cavity, part of pharynx, larynx, trachea, and bronchi
-nonciliated in male urethra
nonkeratinized stratified squamous
Kept moist with secretions like saliva or mucus.
For: abrasion resistance. Protection of underlying tissue.
Location: line mouth, pharynx, mucus membrane, vagina, and anus
Keratinized stratified squamous
Water proof, abrasion resistant. Outside cells are dead and lack nuclei.
For Protection of underlying tissue.
Location: epidermis of skin
For: Secreting and protecting.
Location: Ducts of exocrine glands and some regions of the male urethra.
For: Secreting and protecting
Location: large ducts of salivary glands and membranous parts of male urethra
Change shape depending on how full the urinary bladder is.
Empty bladder: cuboital
Distended bladder: squamous.
Glands purpose and types
Produce an release a chemical product.
Endocrine glads" produce hormones and release it into the blood (ductless glands)
Exocrine glands: produce secretion and release it onto an epithelial surface through a duct.
Parts of exocrine glands
Acini: Cells that produce secretion and release them into duct.
Duct: conducts product to epithelial surface.
Tubular (simple, branched, compound)
secretory acinus region is same diameter as duct
Acinal (simple, branched, compound)
Secretory region is larger in diameter
Produce a product, package it into a vesicle and release it by exocytosis. (Sweat glands)
produce a product at apical surface that buds off cells into duct (mammory glands, pubic or axillary sweat glands)
accumulates product and disintegrates. secretion is mix of cell fragments and product produced by the cell. (sebaceous glands)
CT Resident Cells
Stationary cells that are permanently housed within the CT. Support, maintain, and repair
Most abundant cells
stem cells that repair damaged CT
Cable like fiber, strong flexible, stretch resistance
Thinner than collagen, form mesh framework
Contains Elastin giving elasticity
Made by resistance cells, varies in composition
F: protects organs, binds epithelial to deeper tissue
L: Papillary layer of dermis, subcutaneous layer
F: insulates, cushions, protects, energy store
L: Subcutanious layer, covers organ
Cell: fibroblasts, leukocytes
F: stroma of immune organs
L: spleen, bone marrow
Dense Regular CT
Cell: fibroblasts, collagen fiber
F: Resist stress in one direction
L: ligaments and tendons
Dense irregular CT
Cell: Fibroblasts, Collagen fibers
F: withstand stretch in many directions
L: Dermis, periosteum covering bone, perichondrium covering cartilage, organ capsules
Cell: fibroblasts making elastic fibers
F: stretch and recoil
L: walls of arteries, vocal chords, suspensory ligament of penis
Cell: chondrocytes in lacunae
L: tip of nose, end of long bone, fetal skeleton
Cell:chondrocytes in lacunae, parallel collagen fibers
F: resist conpression, shock absorber
L: Invertebral discs, Pubic symphysis, menisci of knee
Cells: elastic fiber. Chondrocytes
F: Flexible maintains shape
L: External ear, epiglottis
Osteocytes in lacuna
Cells: multinucleate fibers, striated
F: Voluntary movement
L: skeletal muscles attached to bone
Cell: branching fibers, striated.
F: involuntary pumping of the heart
L: Heart wall
Cell: non striated
F: involuntary, moves things through organs
L: walls of hollow organs
F: Rapid control system, voluntary and involuntary movement