Histology Study of Tissues. Level of Organization 1. Cell level – most basic level of organization in living things 2. Tissue level  Group of similar.

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Presentation transcript:

Histology Study of Tissues

Level of Organization 1. Cell level – most basic level of organization in living things 2. Tissue level  Group of similar cells  Perform the same function

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

Histology – Study of Tissues

How do Cells Stick Together? 1.Recognize “like” cells Surface Glycoproteins  95% Carbohydrate  Identity “markers”

How do Cells Stick Together? 2. Cell connections – Tight junctions – Desmosomes – Gap junctions

Tight Junction Desmosomes Gap Junction

Tight Junctions Cells are “sewn” together Prevents passage between cells

Desmosomes “Spot- welded” together Prevents Cells from being pulled apart

Gap Junctions Tunnel or channel connection Allows transfer of materials between cells

Epithelial Tissue Function 1. Protection 2. Lining 3. Absorption

Epithelial Tissue Function 4. Filtration 5. Secretion

Connective Tissue Function 1. Support 2. Bind

Connective Tissue Function 3. Connect 4. Defend

Muscle Tissue Function 1. Contraction 2. Movement

Nervous Tissue Function 1. Control 2. Receive, integrate, respond

Nervous Tissue Function 3. Conduct action potential

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