Chapter 4. 4 major types of tissues Epithelial tissue- Covers surface of body, lines hollow organs...
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Transcript of Chapter 4. 4 major types of tissues Epithelial tissue- Covers surface of body, lines hollow organs...
![Page 1: Chapter 4. 4 major types of tissues Epithelial tissue- Covers surface of body, lines hollow organs and body cavities. Ex: Skin and stomach tissue Connective.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649f0d5503460f94c20b7a/html5/thumbnails/1.jpg)
Cell ConnectionsChapter 4
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4 major types of tissuesEpithelial tissue- Covers surface of body,
lines hollow organs and body cavities. Ex: Skin and stomach tissue
Connective tissue- Holds organs in place, protects and supports body. Ex: Tendons and ligaments
Muscular tissue- Generates physical force and movements. Ex: Biceps, quadriceps
Nervous tissue- Helps control and coordinate body movement by detecting changes and responding with nerve impulses. Ex: Brain and spinal cord
![Page 3: Chapter 4. 4 major types of tissues Epithelial tissue- Covers surface of body, lines hollow organs and body cavities. Ex: Skin and stomach tissue Connective.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649f0d5503460f94c20b7a/html5/thumbnails/3.jpg)
To function in a coordinated way as part of a tissue, cells must have cell junctions.
Cell junction- points of contact between neighboring plasma membranes.
Imagine trying to build a house with nothing to hold the lumbar, roof, and walls together.
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Plant cellsPlasmodesmata- Channels between adjacent
plant cells. They form a circulatory and communication system connecting the cells in plant tissues.
*Helps water and small molecules pass easily from cell to cell.
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Animal cellsAdjacent cells in animal tissues also connect
by cell junctions; there are three types:
Tight junctionsAnchoring junctions
(desmosomes)Gap junctions
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![Page 7: Chapter 4. 4 major types of tissues Epithelial tissue- Covers surface of body, lines hollow organs and body cavities. Ex: Skin and stomach tissue Connective.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649f0d5503460f94c20b7a/html5/thumbnails/7.jpg)
Tight junctionsBind cells very tightly togetherForms a leakproof sheetPrevents passage of materialsLines digestive tract, preventing contents from leaking into surrounding tissues.
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Anchoring junctionsStrongly link cells together with cytoskeletal
fibersForms strong sheetsCommon in tissues that have to stretch, such
as skin and heart muscle.Helps keep skin cells from separating
Ex: Desmosomes
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Gap junctionsChannels similar to plasmodesmata in plant
cellsAllows small molecules to flow between
neighboring cells.Important for chemical communication.