tissue types histology how we examine tissues: teased, smeared or squashed samples, scraped – we...
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Tissue Types
Histology
How we examine tissues:Teased, smeared or squashed samples,
scraped – we are looking at whole cells
Thin sections – very thin sections of the tissue are made using a microtome after tissue has been either frozen or embedded in some sort of solid substance like wax or plastic –
Staining – In either case stains are used so enhance contrast in the specimen
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Key Terms
Histology: the study of tissues.
Tissues: groups of cells which are similar in
structure and which perform common or related functions.
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Muscle Tissue
• Muscle tissue is a specialized tissue that are able to contract.
• Two types of muscle tissue…•Voluntary-muscles that you are able to control
• Involuntary-muscles that you cannot control
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Muscle tissue
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Skeletal Tissue• Skeletal tissue moves bones
• Most common type of muscle• Voluntary muscles • Wear out quickly and tire more
easily• Look branched or striated• Example: Tendons-the thick bands
of tissue that attach muscle to bone.
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Skeletal Tissue
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Cardiac Muscle
• Found only in the heart• Involuntary muscle• Contracts an average of 70 per minute each day• Cardiac muscle is striated, like skeletal muscle
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Smooth (visceral) muscles-found in many internal organs
• Involuntary muscles• Contract and relax slowly• Appear very branched, spindle-shaped• Examples: Blood vessels, bladder, stomach
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Epithelial Tissue
• Pack tightly together and form continuous sheets that serve as linings in different parts of the body.
• A. lines our organs• B. ex. Stomach lining and outer layer of skin.
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Connective tissue
• There are many types of connective tissue in the body.
• Adds support and structure to the body.• Some examples include inner layers of skin,
tendons, ligaments, cartilage, bone and fat tissue.• Blood is also considered a form of connective
tissue.
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Connective Tissue
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Nerve Tissue
• Contains two types of cells: neurons and glial cells.
• Has the ability to generate and conduct electrical signals in the body.
• These electrical messages are managed by nerve tissue in the brain and transmitted down the spinal cord to the body.
• Gives signals to muscles and informs us of environmental conditions (hot, cold, humid)
• Examples are brain, spinal cord, nerves
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Nervous Tissue