connective tissue notes - mr. hardin's class
TRANSCRIPT
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Name and draw two types of epithelial tissue.
Give their function.
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• Found everywhere in the body• Includes the most abundant and widely distributed tissues• Functions
Binds body tissues togetherSupports the bodyProvides protectionInsulates to maintain body temperatureTransportation of other molecules
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Unique Characteristics1. common origin‐ all arise from embryonic tissue 2. Degrees of vascularity‐ cartilage is avascular while other types have rich blood supply3. Extracellular matrix‐ connective tissue more able to bear weight, withstand tension, and endure abuses because unlike other tissues it is not made up mostly of cells.
• Most abundant tissue in body
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3 Main Elements
1. Ground Substance2. Fibers3. Cells
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1. Ground Substance: unstructured material that fills the space between the cells and contains the fibers. This is consists mostly of fluid and proteins. ‐fibers not included as ground substance ‐Matrix includes ground substance and fibers
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2. Fibers: provide support. 3 types: collagen, elastic and reticular fibers. • Collagen fibers: protein. Extremely tough
and provide high tensile strength. (white)• Elastic fibers: long and thin that form
branches. Elastin protein. Moves like a rubber band. (yellow) Found in skin, lungs, blood vessels.
• Reticular Fibers: very fine fibers that branch extensively. Surround small blood vessels and support tissue of organs.
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3. Cells‐ composed of many types1. Blast Cells: undifferentiated cells
‐fibroblast‐ chondroblast‐osteoblast‐hematopoietic stem cells
2. Fat Cells‐ nutrient storage3. Blood cells‐ defense4. Plasma Cells‐produce antibodies5. Macrophages‐ dispose of dead tissue cells and act in
immune response
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