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Compare & Contrast Single Cell & Multicellular Tissue
Absorb nutrients directly / absorption won't nourish full tissue
Excrete waste / how can each cell excrete to outsider tissue?
Respond to environment / need a communication network
Reproduce by cell division / whole new tissues, organs or organisms can't simply reproduce by cell divisions
Overview of Epithelium
Layers: can be simple or stratified
Comes in a Variety Shapes
Lining for EVERY Lumen of the body
Forms boundaries between different environments, protects, secretes, absorbs, filters
Overview of Muscle Tissue
Skeletal - attach to bones
Smooth - attach to organs
Contracts to cause movement
Everything that's not an epithelium, muscle or neuron
Supports, protects, binds other tissues together
Where do you find Muscle Tissues
Muscles attached to bones (skeletal)
Muscles of heart (cardiac)
Muscles of walls of hollow organs (smooth)
Where do you find Epithelial Tissues
Skin surface (epidermis)
Lining of GI tract organs and other hollow organs
Classification of Epithelium based on number of cell layers
Simple vs. Stratified.
In simple, one layer of cells forms apical surface on top of basal surface; best for diffusion/absorption.
In stratified, several layers between apical and basal are good for protection.
Classification of Epithelium based on shape
Flat, plate-like: Squamous (found in kidneys, lungs, lymphatic & blood vessels, cavity linings) where high diffusion is needed)
Cube-shaped: Cuboidal (found in glands, kidneys, ovaries; function is secretion and absorption)
Column: Columnar (good for absorption and secretion, especially areas requiring protection, as in digestive tracts; also in gall bladder, ducts, brohchii, uterine tubes, uterus). Ciliated kinds move mucus by ciliary action.
Pseudostratified columnar epithelium
See slide - positions of nuceli
Often found in respiratory tract: trachea, bronchii
Stratified squamous epithelium
See slide - for protection, inside the body (no keratinization)
High-abrasion areas: mouth, rectum, vagina
Only found in the urinary system; resembles both stratified squamous and stratified cuboidal; basal cells cuboidal or columnar; surface cells dome shaped or squamouslike, depending on degree of organ stretch.
Function: Stretches readily and permits distension of urinary organ by contained urine.
Excrete onto body surfaces on into body cavities
Compare to endocrine = "internally secreting"
Multicellular exocrine glands classifications
Simple v. Compound duct structure
Tubular v. Aveolar secretory structure
Merocrine v. Holocrine (modes of excretion)
Types of cells in Loose (Areolar) Connective Tissue
Fibers (collagen, elastic, reticular)
Dense Irregular Connective Tissue
Spaces make it irregular, slightly looser than dense regular
Found in external ear (pinna or auricle), epiglottis (between the oral pharynx and _______ pharynx -- prevents aspiration)
Bone (oseous) tissue
Concentric rings - doesn't look like anything else
Site for red blood cell production
Salts and Minerals stored there
Yellow bone marrow - fat (mostly in the long bones)
Red bone marrow
Found in all bones
Branching, striated, uninucleate cells
Intercalated discs (electricity, calcium reaction site)
Fusiform (elongated football) or spindle shaped
Found in organs
Classes of Membranes
Mucous membranes (open to the exterior): mucosa of naval cavities, mouth, lung bronchi, esophagus lining
Serous membranes (closed to the exterior): parietal/visceral peritoneum (abdomen), pericardium (heart), pleura (lungs)
Aspects of Non-specific Inflammatory Response (Tissue Repair)
Severed blood vessels bleed and inflammatory chemicals are released (HELP HELP!)
Local blood vessels become more permeable, allowing white blood cells (neutrophils), fluid, clotting proteins and other plasma proteins to seep into the injured area.
Clotting occurs (platelets); surface dries and forms a scab.
Tissue cells start to divide more frequently.
Aspects of Organization (Tissue Repair)
• The clot is replaced by granulation tissue, which restores
the vascular supply.
• Fibroblasts produce collagen fibers that bridge the gap.
• Macrophages phagocytize cell debris.
• Surface epithelial cells multiply and migrate over the
Aspects of Regeneration/Fibrosis (Tissue Repair)
• The fibrosed area matures and contracts; the epithelium
• A fully regenerated epithelium with an underlying area of
scar tissue results (functionality not completely the same as before)
Name three types of Embryonic germ layers (and the primary tissues they produce)
Ectoderm: Nervous tissue and epithelium
Mesoderm: Muscle and connective tissue, epithelium
Two Layers of Skin
Epidermis: no vasculature
(Hypodermis - superficial fascia - is beneath, NOT part of skin)
Two Layers of Dermis
Papillary Layer (dermal papillae share info & substances between layers)
What is attached to the edge of a follicle?
Arrector pili muscle (goose bumps, hair on end); also Sebaceous (oil) glands - releasing SEBUM
Name the five layers of the epidermis
Most superficial layer; 20-30 layers of dead cells represented only by flat membranous sacs often filled with keratin. Glycolipids in extracellular space. Functions as protection.
Three to five layers of flattened cells, organelles deteriorating; cytoplasm full of lamellated granules (release lipids) and keratohyaline granules.
Where keratinization begins
Several layers of keratinocytes unified by desmosomes. Cells contain thick bundles of intermediate filaments made of pre-keratin.
Largest of layers; cells not dividing
Deepest epidermal layer; ONE row of actively mitotic stem cells; some newly formed cells become part of the more superficial layers.
See occasional melanocytes and epidermal dendritic cells.
Origination for the other 3-4 layers; the only layer that receives food and has cells dividing.
specialized macrophages with specific localities of the epidermis, oral mucosa, esophagus, vagina, and lymphatic organ
Rule of 9s for Assessing Burns
Legs - each 9%
Arms - 9% total (4-1/2% each)
Anterior trunk - 18%
Head and Neck - 9% (4-1/2% ...
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