Histology

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Histology

• Study of
• Tissues

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Level of Organization

• Cell level most basic level of organization in
  living things
• Tissue level
• Group of similar cells
• Perform the same function

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Level of Organization

• 3. Organ level a group of tissues working
  together
• 4. Organ System several organs working together
  as one unit
• 5. Organism an individual that can carry out
  life processes by means of organ systems

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• Histology
• Study of Tissues

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How do Cells Stick Together?

• Recognize like cells
• Surface Glycoproteins
• 95 Carbohydrate
• Identity markers

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How do Cells Stick Together?

• Cell connections
• Tight junctions
• Desmosomes
• Gap junctions

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Tight Junction
Desmosomes
Gap Junction
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Tight Junctions

• Cells are sewn together
• Prevents passage between cells

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Desmosomes

• Spot-welded together
• Prevents Cells from being pulled apart

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Gap Junctions

• Tunnel or channel connection
• Allows transfer of materials between cells

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Epithelial Tissue

• Function
• Protection
• Lining
• Absorption

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Epithelial Tissue

• Function
• Filtration
• Secretion

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Connective Tissue

• Function
• Support
• Bind

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Connective Tissue

• Function
• Connect
• Defend

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Muscle Tissue

• Function
• Contraction
• Movement

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Nervous Tissue

• Function
• Control
• Receive, integrate, respond

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Nervous Tissue

• Function
• Conduct action potential