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Lecture 18

THEATER 10 Lecture Notes - Lecture 18: Microtubule Organizing Center, Fluid Compartments, Extracellular Fluid

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Protein filaments that supports cell and gives it shape, move cell structures etc.
3 Protein Fibers:
1. Microfilaments (Actin Stress Fibers) // Protein: Actin
Serves as track for movement of motor protein, myosin.
2. Intermediate Filaments // Protein : Keratin
More permanent than actin filament (grow/disassemble quickly)
Maintains cell shapes, bear tension, provide structural support to cell.
Resist pulling forces; strong guy-wires.
3. Microtubules // Protein : Tubulin
Grows and shrink quickly
Resists compression forces
Provide tracks for movement of cilia, flagella, chromosomes etc.
Microtubule Structure and Function
Microtubules are key components of (3) eukaryotic cell structures:
1. Centrosome
Main microtubule organizing center
Direct movement of microtubules
Assembles tubulin into microtubules
2. Centrioles
Contained in centrosome
Direct DNA movement in cell division
3. Cilia
Movement across cells
4. Flagella
Cell (sperm) movement through fluid (move an entire cell)
Topic 6 Plasma Membrane
Plasma (Cell) Membrane
Double layer (bilayer) of lipid molecules
Separates 2 of the body's major fluid compartments:
o Intracellular fluid (within cell)
o Extracellular fluid (outside and between cells)
Acts as a security fence surrounding manufacturing plant (cell)
1. Protective barrier against substances/forces outside the cell
2. Some membrane proteins acts as receptors (bind to specific molecules arriving from
outside cell) after binding, can induce a change in cellular activity.
3. Controls which substances can enter and leave cell.
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