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Function of Epithelial tissue
- Physical Protection for exposed and internal surfaces from dehydration, abrasion, and physical, chemical and biological agents
- Slective permeability - regulates the passage of certain molecules in or out of a certain region of the body.
- Secretion - some epithelial cells called exocrine cells produce secretions such as sweat or oil.
- Sensations - possess nerve endings that can detect light, taste, sound, smell and hearing.
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Connective Tissue Function
- Physical Protection
- Support & Structural framework
- Binding of structures
- Storage
- Transport
- Immune Protection
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Muscle Tissue Function
Facilitates movement of skeleton or organ walls
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Nervous Tissue Function
Neurons: Control Activities, process information
Glial Cells: Support and protect neurons
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Types of Intercellular Junctions
- Tight Junctions
- Adhering Junctions
- Desmosomes
- Gap Junctions
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Tight Junctions
- Relays information to other cells.
- Prevent passage of molecules and ions through the space between cells, so they must pass through the cell (by diffusion or active transport).
Example: Muscle Memory
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Adhering Junctions
- Provide strong mechanical attachments between adjacent cells.
- Hold cardiac muscle cells tightly together as the heart expands and contracts
- Hold epithelial cells together
- responsible for contact inhibition
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Gap Junctions
- Permit free passage between the cells of ions and small molecules.
- Permit change in membrane potential to pass from cell to cell.
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Desmosomes
localized patches that hold two cells tightly together.
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Characteristics of Epithelial Tissue
- Cellularity
- Polarity
- Attachment
- Avascularity
- Innervention
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What Tissue is the arrow pointing to?
Simple Squamous Epithelium
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Simple Cuboidal Epithelium
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Simple Columnar Epithelium
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Stratified Squamous Epithelium
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Stratified Cuboidal Epithelium
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Stratified Columnar Epithelium
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Psudostratified Columnar Epithelium (ciliated)
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Transitional Epithelial Tissue
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Structural Components of Connective Tissue
- Cells - different cells for different types of CT....bone cells, cartilage cells, fat cells
- Protein Fibers - elastic fibers, collagen, reticular fibers
- Ground Substance - a mixture of proteins and carbs with variable amounts of salts and H2O
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Location of simple simple squamous epithelium?
Lining of heart chambers
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Location of simple simple cuboidal epithelium?
Kidney Tubules
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Location of simple simple columnar epithelium?
1. ciliated
2. nonciliated
- 1. lining of uterine tube
- 2. lining of stomach, or digestive tract
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Location of simple Stratified Squamous epithelium?
1. Keratinized
2. Nonkeratinized
- 1. Epidermis of skin
- 2. vagina
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Location of simple Stratified Cuboidal epithelium?
Duct of sweat gland
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Location of simple Stratified Columnar epithelium?
Male Urethra
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Location of simple Psuedostratified Columnar epithelium?
- nasal cavity lining
- trachea
- larynx
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Location of simple Transitional epithelium?
Lining of urinary bladder
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Muscous Connective Tissue
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Areolar Connective Tissue
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Adipose Connective Tissue
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Reticular Connective Tissue
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Dense Regular Connective Tissue
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Dense Irregular Connective Tissue
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Elastic Connective Tissue
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Location of Mesenchyme
Body of embryo, fetus and adult
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Location of Mucous Connective Tissue
Umbilical chord of fetus
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Location of Areolar Connective Tissue
Subcutaneous Layer under skin
Papillary layer of dermis
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Location of Adipose Connective Tissue
Fat cells which stores energy
- covers and surrounds some organs
- Hypodermis
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Location of Reticular Connective Tissue
- stroma of lymph nodes
- spleed
- thymus
- bone marrow
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Location of Dense Regular Connective Tissue
tendons, most ligaments
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Location of Dense Irregular Connective Tissue
Reticular layer of Dermis
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Location of Elastic Connective Tissue
Aorta wall
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Location of Hyaline Cartilage, Supporting Connective Tissue
- Articular Cartilage on bone
- most of fetal skeleton
- Trachea
- Nose
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Location of Fibrocartilage, Supporting Connective Tissue
Intervertebral Discs
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Location of Elastic Cartilage, Supporting Connective Tissue
External ear
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Location of Skeletal Muscle Tissue
- Attaches to bones or sometimes skin
- Makes the muscle contract
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Location of Cardiac Muscle Tissue
Heart Wall
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Location of Smooth Muscle Tissue
muscularis of small intestine.
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Location of Nervous Tissue
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What are chondrocytes?
- Cartilage cells
- They secrete gel-like extracellular matrix containing collagen and elastic fibers
- Occupy small spaces enclosed by their extracellular matrix called lacunae
- Provide support and withstand deformation such as the nose and the ear.
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What are osteocytes?
- Bone cells
- Extracellular matrix is a unique mix of collagen and bone salts
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What is Fluid connective tissue composed of?
- Erythrocytes
- Leukocytes
- Platelets
- Plasma
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What are Erythrocytes?
Red blood cells
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What are Leukocytes?
White blood cells
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What are platelets?
Fragments of blood cells involved in blood clotting
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What is plasma?
a watery ground substance containing protein fibers
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What types of cells are in the nervous tissue?
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What are neurons?
Nerve cells that are capable of initiating and conducting electrical activity throughout the body
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What is Neuroglia?
cells that support the neurons
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