Lipid Bilayer: Structure & Intracellular and Extracellular Fluid

by Thad Wilson, PhD

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    So mainly, phospholipids are going to be the main processes of cell membrane walls and organelles membrane walls. These involve having a small little lipid bilayer, meaning that it has a little bit of a structure in between two other structures and we’ll get to be what that is in a minute. Phospholipids, glycolipids, and cholesterol make up the predominant way in which we have this bilayer take place. And you notice that all three of these phospholipids, glycolipids, and cholesterols have a colored component that’s on one side and a tail component component that’s on the other. And this is very important in how these molecules will eventually orient to two different sides of the membrane. So let’s get to those now. If you have a phospholipid and you place it within water and oil, the heads of the phospholipids will face the water and the tails will face the oil, and we call those tails that face the oil nonpolar ends. Polar ends, however, will face towards the water and this allows for a natural barrier that will occur. But remember that we have a double layered membrane, meaning that we have water on both sides of the membrane. Therefore, you’re going to have polar heads facing both of the water sides. Interestingly, things like phospholipids oftentimes can move a little bit within the wall. But they usually only move back and forth or maybe they spin around a little bit, but they don’t flip flop very often from one side of the membrane to the other. Now, why are you partitioning some of these particulars spaces? Well, one is that the fluid inside the cell is often very different than the fluid outside of the cell. We call the fluid within the cell intracellular fluid and the...

    About the Lecture

    The lecture Lipid Bilayer: Structure & Intracellular and Extracellular Fluid by Thad Wilson, PhD is from the course Membrane Physiology.

    Included Quiz Questions

    1. Toward the inside and outside of the cell
    2. Toward the extracellular matrix only
    3. Toward the nucleus
    4. Toward the hydrophobic side
    5. Toward the hydrophilic side on the inside of the cell
    1. Potassium
    2. Magnesium
    3. Chloride
    4. Bicarbonate
    1. Phospholipids, glycoproteins and cholesterol
    2. Proteins
    3. Triglycerides
    4. Recurring glucose moieties
    5. Glucose, proteins and triglycerides
    1. Five nanometers
    2. Ten nanometers
    3. Eight microns
    4. Three microns
    5. Two microns
    1. The hydrophobic, or non-polar ends
    2. The polar ends
    3. The round-headed ends
    4. The ionized ends
    5. The electrically charged ends
    1. Side to side or rotate
    2. Flip
    3. Upside down and sideways
    4. Exchange position with parts of the glycoproteins
    5. Separate heads from tails
    1. To establish an electrochemical gradient
    2. Because the intracellular protein components are ionized
    3. Because the extracellular fluid has the most ions
    4. Because the intracellular fluid has the most ions
    5. Because the extracellular fluid has the most proteins
    1. Pores
    2. Ion Channels
    3. Solute Carriers
    4. ABC transporters
    5. V Type ATPases
    1. The pH is roughly the same in all compartments
    2. In the intracellular compartment
    3. In the extracellular compartment
    4. In the interstitial fluid
    5. In the intravascular compartment
    1. In the intracellular compartment
    2. In the extracellular compartment
    3. In the interstitial fluid
    4. In the intravascular compartment
    5. Roughly the same in all compartments

    Author of lecture Lipid Bilayer: Structure & Intracellular and Extracellular Fluid

     Thad Wilson, PhD

    Thad Wilson, PhD

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