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What are tissues?
Group of cells that perform same geeral function
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What are the four types of tissues?
- 1. Epithelial
- 2. Connective
- 3. Muscle
- 4. Nervous
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What is the function of Ep tissue? (4)
- - protection
- - secretion
- - absorption
- - excretion
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Where is Ep Tissue located? (3)
- - covers body surface
- - covers/lines internal surfaces
- - composes glands
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Characteristics of Ep Tissue: (5)
- - continuous cellular sheet
- - lacks blood vessels
- - has basement membrane
- - readily divides
- - tightly packed
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Cancer cells: (2)
- - spread by secreting substance into basement membranes
- - allows to spread to adjacent cells
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Types Ep Tissue
Identified by number of cell layers: (3)
- 1. Simple > 1 layer (substances easily pass through)
- 2. Stratified > multi-layered (thick!)
- 3. Psuedostratified > 1 layer but looks like multiple (touches basement; ofte have cilia and goblet cells)
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Types Ep Tissue
Identified by shape: (3)
- 1. Squamos > flat cells
- 2. Columnar > tall, cylindrical cells
- 3. Cuboidal > cube shaped
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Characteristics of Simple Squamos cells: (5)
- 1. Single layer of flat cells
- 2. Substances pass easily
- 3. Form air sacs of lungs (alveoli)
- 4. Form capillaries (exchange substances)
- 5. Form membranes that line body
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Characteristics of Simple Cuboidal cells: (4)
- 1. Single layer of cube cells; square marshmallow
- 2. Cover ovaries
- 3. Line kidney tubes
- 4. Line ducts of glands
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Characteristics of Simple Columnar cells: (3 types)
- single layer of columnar cells
- A. Ciliated > tiny hair like structures
- 1. Line Reproductive tubes
- B. Non-ciliated > lack cilia
- 1. Line digestive tract: stomach, small intestine, large intestine
- C. Specialized cells may have Microvilli
- 1. Small, finger like extension to increase surface area for absorption
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Characteristics of Psueadostratified Columnar cells: (3)
- 1. Single layer of columnar cells that appear stratified
- 2. Lines passage way of respiratory sys
- 3. Secrete mucous to trap dust (goblet cells)
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Characteristics of Stratified Squamos cells: (9)
- 1. Many layers of flat cells
- 2. Deep layers are cube or columnar shaped
- 3. Superficial layers are squamos cells
- 4. Cells replicate at basement membrane
- 5. Older cells are pushed away from basement membrane
- 6. Older cells accumulate protein (keratin) > Cells harden and die
- ***7. Compose the outermost layer of skin (epidermis)
- 8. Lines oral cavity
- 9. Lines anal cavity
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Characteristics of Stratified Cuboidal cells: (2)
- 1. Two or three layers of cube cells
- 2. Lines larger ducts and tubules (usually secretes)
- > Mammary glands
- > Sweat glands
- > Salivary glands
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Characteristics of Stratified Columnar cells: (3)
- 1. Several layers of columnar cells
- 2. Lines the pharynx
- 3. Lines vas deferens
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Characteristics of Transitional Epithelium cells: (2)
- 1. Specialized ep > changes shape in response to tension
- 2. Lines urinary bladder
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Characteristics of Glandular Epithelial cells: (3)
- 1. Specialized ep > produce/secrete substances
- 2. Form Exocrine glands > secrete into ducts (tubes destined for outside)
- * Stomach = OUTSIDE you body
- 3. Form Endocrine glands > secrete into tissue or blood
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