Cell Membrane Structure

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How wide is the phospholipid layer?
7nm
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What is the structure of the phospholipid?
The phosphate head is polar so hydrophilic and the fatty acid tails are nonpolar so are hydrophobic
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When added to water, how are the phospholipids arranged?
The phosphate heads are in contact with water but the tails are not
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What does cholesterol do to the cell membrane?
It maintains its fluidity
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What does more cholesterol mean to the fluidity and the permability of the cell membrane?
More cholesterol makes the membrane less fluid and less permeable
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What is diffusion?
Diffusion is the net movement of particles from a region of high concentration to a region of low concentration without the use of energy
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What is osmosis?
The passive movement of water molecules from a region of high concentration of water (and low concentration of solute) to a region of low concentration of water (and high concentration of solute) across a semi-permeable membrane
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What is active transport?
Active Transport is the assisted movement of molecules or ions against the concentration gradient from a region of low concentration to a region of high concentration by using energy
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What is facilitated diffusion and why would it be required?
Facilitated diffusion is the process of moving polar or large molecules across the cell membrane through protein channels from a high concentration to a low concentration gradient without the use of energy
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What is exocytosis?
Exocytosis is the process of releasing substances from cells
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What is endocytosis?
Endocytosis is the process of absorbing substances into cells
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What is the process of endocytosis?
The cell membrane invaginates or engulfs the substance to be absorbed into the cell. A phagocytic vacuole is formed around the substance.
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What is phagocytosis?
This is what endocytosis is called when the substance being engulfed is a solid
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What is pinocytosis?
This is what endocytosis is called when the substance being absorbed is a liquid.
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Other cards in this set

Card 2

Front

What is the structure of the phospholipid?

Back

The phosphate head is polar so hydrophilic and the fatty acid tails are nonpolar so are hydrophobic

Card 3

Front

When added to water, how are the phospholipids arranged?

Back

Preview of the front of card 3

Card 4

Front

What does cholesterol do to the cell membrane?

Back

Preview of the front of card 4

Card 5

Front

What does more cholesterol mean to the fluidity and the permability of the cell membrane?

Back

Preview of the front of card 5
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