THE STUDY OF TISSUES Histology. What are tissues? Tissues are collections of specialized cells and...
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Transcript of THE STUDY OF TISSUES Histology. What are tissues? Tissues are collections of specialized cells and...
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THE STUDY OF TISSUES
Histology
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What are tissues?
Tissues are collections of specialized cells and cell products that perform a limited number of functions.
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Four Basic Tissue Types
Epithelial – lining and secretory tissueConnective – supportive and nutritive tissueMuscular – contracts to produce movementNervous – integration and control
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Characteristics of Epithelial Tissue
Cellularity– epithelia are composed almost entirely of cells bound closely together by interconnections called cell junctions.
Polarity-epithelial tissue have an exposed surface (apical cells) that either faces the exterior of the body or some internal space and a base (basal cells).
Attachment—the base of the epithelium is bound to a thin basal lamina or basement membrane.
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More characteristics of Epithelial Tissue
Avascularity—epithelia are avascular, which means that they lack blood vessels. They have to get their nutrients by diffusion or absorption
Regeneration—epithelial cells that are damaged or lost are continuously replaced by the stem cells in the epithelium
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Functions of Epithelial Tissue
Four major functions: Provide physical protection Control permeability Provide sensation (They have a large sensory nerve
supply.) Produce specialized secretions (Glands)
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Naming Epithelial Tissue based on shape
Epithelium is named according to shape, structure, and arrangement of cells.
Shapes of Epithelium
•squamous - thin and flat cells
•cuboidal - cube shaped cells
•columnar - column shaped cells
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Naming Epithelial Tissue based on layers
simple - single layer of cells
stratified - multilayered cells
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pseudostratified - false stratified
ciliated - cells possess cilia
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-STRUCTURE, FUNCTION, AND LOCATION OF SEVEN EPI THELIAL T I SSUE TYPES-WHAT EACH T ISSUE TYPE LOOKS L I KE ENOUGH TO BE ABLE TO I DENTI FY THE TYPE FROM A P ICTURE
What do you HAVE to know?
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The 7 Epithelial Tissue Types that you have to know are . . .
Simple SquamousSimple CuboidalSimple ColumnarStratified SquamousStratified Cuboidal (sometimes referred to as
Transitional)Pseudostratified Ciliated ColumnarKeratinized (or Cornified) Stratified
Squamous
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Simple Squamous Epithelium
Structure-The thinnest tissue of the body. One layer, flattened (squashed) nucleus.
Function-Allows transport across membranes in lungs and capillaries. Secretes fluid in serous membranes (e.g. pericardial and pleural membranes, mesenteries).
Location-Lines cardiovascular system, covers organs, forms glomerular capsules in kidney.
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Simple Cuboidal
Structure-single layer, cube-like cells with spherical (round) nuclei.
Function-secretion, absorption
Location-Kidney tubules, small ducts of glands
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Simple Columnar
Structure
Function
Location
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Stratified Cuboidal (sometimes referred to as “Transitional”)
Structure- many layered (usually 2), cube like cells, spherical (round) nuclei
Function-absorption, secretion
Location- mammary and some sweat glands.
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Keratinized Stratified Squamous
Structure- there is a layer of dead cells above the stratified squamous cells (nearest the apical surface).
Function-protection of areas of external, sometimes extreme abrasion
Location- Palms of hands and soles of feet.
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Summary of Epithelial Tissue
Look for basement membrane and apical surface (could be a lumen).
Determine how many layers there are between the basement membrane and the free or apical surface.
Simple=one layer, stratified=multiple layers, pseudostratified=looks like stratified, but are all connected to the basement membrane
Look at the shape of the cells nearest the apical surface.
Name the cells according to the shapes.
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Name this type
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Quiz Time
Name this tissue type
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Name this tissue type
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Tissue Notes Part 2Muscle and Connective Tissue
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Muscle Tissue
Is specialized for contractionProduces all body movement
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3 Types of Muscle Tissue
Smooth Muscle: found in walls of hollow, contracting organs (blood
vessels; urinary bladder; respiratory, digestive and reproductive tracts)
Skeletal muscle: body muscles responsible for movement
Cardiac muscle: only in the heart
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Skeletal Muscle Cells
Skeletal muscle cells: are long and thin are usually called muscle fibers do not divide new fibers are produced by stem cells (satellite cells)
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Skeletal Muscle
Striated, voluntary, and multinucleated
Figure 4–18a
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MUSCLE TISSUESKELETAL
Voluntary movement
Long and cylindrical
Transverse striation
Each fiber is multi-nuclear
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Smooth Muscle Cells
Smooth muscle cells: are small and tapered can divide and regenerate
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Smooth Muscle Tissue
Nonstriated, involuntary, and single nucleus
Figure 4–18c
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MUSCLE TISSUE
SMOOTH
Involuntary movement
Predominant
Long, spindle shape
Single nucleus
Internal organs
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MUSCLE TISSUECARDIAC
Striations
Involuntary
One nucleus
Deep center
Heart muscle
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Cardiac Muscle Cells
Cardiac muscle cells: are called cardiocytes form branching networks connected at intercalated
disks Where they branch is called a bifurcation. are regulated by pacemaker cells
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Cardiac Muscle Tissue
Striated, involuntary, and single nucleus
Figure 4–18b
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Connective Tissue
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Connective Tissue
The essential characteristic that distinguishes connective tissue from the other three tissue types is that it consists of cells separated from each other by an extracellular MATRIX.
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Cell types in a Matrix
-blast: create the matrix-cytes: maintain the matrix-clasts: breakdown the matrix
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Major Components of the Matrix
Protein fibers Collagen-very strong and flexible but not elastic Reticular-thin and “fillers” of space Elastin-elastic
Ground Substance with non-fibrous proteins and other molecules. Bone Cartilage
Fluid Blood
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Classification of Connective Tissue
Fibrous Connective Tissue Loose Connective Tissue
Areolar Dense Connective Tissue
Regular-very strong in one direction (tendons and ligaments)
Irregular-less strength but in many directions (dermis of skin)
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Areolar
Structure- has a viscous matrix with an irregular arrangement of fibers
Function-loose packing, support, and nourishment for the surrounding structures
Location-widely distributed throughout the body; fascia, which attaches the skin to underlying tissue
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Areolar
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Adipose
Structure-Little extracellular material. The adipocytes, or fat cells, are so full of lipid that the cytoplasm is pushed to the periphery of the cell.
Function-Insulation, packing material, energy storage, and protection of organs
Location-mesenteries, subcutanous area (below the skin) and surrounding organs
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Adipose
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Fibrous (Dense or Collagenous)
Structure-Matrix composed of collagen fibers running in (somewhat) the same direction.
Function-Withstand great pulling forces with great tensile strength and stretch resistance.
Location-Tendons and Ligaments
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Tendon (connects muscle to bone—muscle stretches)
Ligament (connects bone to bone—ligament stretches)
Dense Fibrous
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Cartilage (Hyaline)
Structure-Collagen fibers are small and evenly dispersed in the matrix. The cartilage cells, or chondrocytes, are found in spaces, or lacunae, within the rigid matrix.
Function-Allows growth of long bones. Provides rigidity with some flexibility.
Location-Growing long bones, costal cartilage of ribs, nasal cartilage, articulating surface of bones.
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Cartilage (Hyaline)
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Bone (Compact)
Structure-Hard matrix with osteocytes within lacunae that are distributed around the central canal
Function-Provide strength and support. Forms the outer shell of bones
Location-Shafts of long bones, outer shell on all bones
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Bone (Compact)
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Key to Connective Tissue
Always found in a MATRIX.For American High School Anatomy and
Physiology: A AdiposeA AreolarB BoneC CartilageD/F Dense Fibrous
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Nervous Tissue
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Neuron (Multipolar)
Structure-axon, cell body and dendrite
Function-conduct impulses, store information, process thought
Location-brain, spinal cord, peripheral nerves
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Neuron
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General Review
http://www.gwc.maricopa.edu/class/bio201/histoprc/prac1q.htm
http://www.path.uiowa.edu/cgi-bin-pub/vs/vl_browse.cgi?cat=h_epithelium