SPMD 1-12-12 - SPMD 201/202 1-12-12 ANATOMY Physical...

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SPMD 201/202 1-12-12 ANATOMY Physical isolation-the plasma membrane physically separates the intracellular items from extracellular Selective barrier; membrane potential-it determines what can go in and out of the cell; contents of intracellular have different concentrations than whats outside the cell. Structural support-support shape and all cellular contents inside Comm with other cells-diff cells can recognize, comm with cells and envt Made of -45-50% lipids-fluid portion -45-50% proteins -4-8% carbohydrates Phospholipids 1. Form a bilayer 2. Polar, hydrophilic head 3. Non-polar, hydrophobic tail Cholesterol: -provides stability (more cholesterol, more rigid) Proteins: - Integral (intrinsic) - peripheral(extrinsic) o can bind to the PM or an integral protein Cytoskeleton - network of protein filaments that extends throughout the cytosol. Microtubules: - made of TUBULIN - internal scaffold, transport, cell division Microfilaments: - made of ACTIN Intermediate filaments: - shape and rigidity of cells
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SPMD 1-12-12 - SPMD 201/202 1-12-12 ANATOMY Physical...

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