BODY TISSUES

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BODY TISSUES

• TISSUES groups of cells that work together
• ORGANS- groups of tissues working together

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4 Primary tissue types

• 1. EPITHELIUM- overall role is covering
• 2. CONNECTIVE- overall role is support
• 3. NERVOUS- overall role is control
• 4. MUSCLE- overall role is movement

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EPITHELIAL TISSUE

• the lining, covering, and glandular tissue of the
  body
• nearly all substances given off or received by
  the body must pass through epithelium
• functions- protection, absorption, filtration and
  secretion

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Characteristics of Epithelium

• -fit closely together to form a continuous sheet
• -always has one surface exposed called the APICAL
  SURFACE
• -lower surface rests on the BASEMENT MEMBRANE- a
  structureless material secreted by the cells
• -depend on diffusion from capillaries in the
  underlying tissue for food and oxygenNO DIRECT
  BLOOD SUPPLY
• - regenerate easily if well nourished

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2 types of layer classification

• SIMPLE- a single layer of epithelial cells
• STRATIFIED- more than one cell layer of
  epithelial

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3 classifications of shape

• 1. SQUAMOUS- flattened
• 2. CUBOIDAL- cube shaped
• 3. COLUMNAR- column shaped

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TYPES OF EPITHELIA
Types of epithelium Description/function Examples in the body
Simple Squamous
Simple cuboidal
Simple Columnar
Pseudostratified columnar (ciliated)
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TYPES OF EPITHELIA
Types of epithelium Description/function Examples in the body
Stratified Squamous
Stratified Cuboidal/ columnar
Transitional
Glandular
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Simple squamous
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Simple Cuboidal
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Simple Columnar
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Pseudostratified columnar
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Stratified Squamous