THEATER 10 Lecture Notes - Lecture 18: Microtubule Organizing Center, Fluid Compartments, Extracellular Fluid
Course CodeTHEATER 10
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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:
• Main microtubule organizing center
• Direct movement of microtubules
• Assembles tubulin into microtubules
• Contained in centrosome
• Direct DNA movement in cell division
• Movement across cells
• 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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