Animal Tissues

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Animal Tissues

• A Quick Introduction

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Tissue Categories

• Def- Group of cells that work together to perform
  a specific function
• Categories
• Connective tissue
• Epithelial tissue
• Muscle tissue
• Nervous tissue

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Connective tissue

• Composed of both cells and exogenous matrix
  material
• Usually holds other tissues together
• Includes osseous tissue (bone) and blood
• Displays a variety of appearances

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Connective tissues
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More Connective Tissues
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Epithelial Tissue

• Covers surfaces and lines cavities
• Protect, secrete
• 3 major shapes
• Squamous- flat
• Cuboidal
• Columnar
• Major arrangements
• Simple
• Stratified
• Pseudostratified
• Basal membrane

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Epithilial Tissue Types
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Muscle Tissue

• Contractile tissue
• Contains protein fibers that mediate movement
• 3 major types
• Cardiac
• Skeletal
• Smooth

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Cardiac Muscle Tissue

• Found only in the heart
• Striations
• Intercalated discs
• Branched arangement
• Automaticity

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Skeletal Muscle Tissue

• Moves bones
• Striations
• Peripheral nuclei
• Elongated cells
• Parallel arrangment

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Smooth Muscle Tissue

• Involuntary movement of soft tissues
• Arteries
• Intestines
• Bladder
• Non-striated
• Spindle shaped

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Nervous Tissue

• Neurons
• display an action potential
• Elongated, 3 parts
• Dendrite, soma, axon
• Transmit impulses
• Glial cells
• Support neurons
• Some insulate neurons

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Nervous tissue
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Summary

• Tissues are groups of cells that work together to
  perform a specific function
• Tissues come in a wide variety of types
• Each type has characteristics that allow its
  identification
• The colors seen in tissue samples are artificial
  and due to the staining technique used.
  Identification must be made based on more
  consistent characteristics