Term
| Is the plasma membrane permeable? |
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Definition
| Most membranes are selectively permeable. A lesser number may be permeable or impermeable. |
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Term
| What are the two classifications for active transport? |
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Definition
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Term
| What is the direction of movement for molecules during diffusion? |
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Definition
| Molecules move "down" a gradient during diffusion. |
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Term
| What is the difference between simple diffusion and facilitated diffusion? |
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Definition
| Both forms of diffusion deal with molecules that travel "down" a concentration gradient, but facilitated diffusion alone uses protein transporters in order to move substances across a membrane that otherwise would not allow for the diffusion without the channels. |
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Term
| Which factors influence the rate of diffusion? |
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Definition
1. molecular weight
2. permeability of the membrane
3. surface area of the membrane
4. magnitude of gradient
5. temperature
6. thickness of the membrane |
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Term
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Definition
| Osmosis is the passive movement of water across a membrane down its concentration gradient. |
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Term
| To what does the term "tonicity" refer? |
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Definition
| Tonicity refers to the ability of a solution to shape cells by altering internal water volume. |
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Term
| Describe the difference between isotonic, hypotonic, and hypertonic solutions. |
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Definition
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Term
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Definition
| Filtration is the movement of water and solutes through a membrane by hydrostatic pressure. It is caused by a pressure gradient. |
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Term
| In what concentration direction are substances moved during active transport? |
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Definition
| Substances are moved "up" the concentration gradient during active transport. |
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Term
| What is the difference between primary active transport and secondary active transport? |
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Definition
| In primary active transport, energy comes directly from ATP, whereas secondary active transport uses energy from the "downhill" movement of molecules that had previously been moved against their gradient, in order to "hitch a ride" up their gradient. |
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Term
| Which molecules are necessary for the sodium/potassium pump to work? |
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Definition
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Term
| What is the ratio of sodium to potassium in and out across the plasma membrane? |
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Definition
SOPI = Soapy = Sodium Out/Potassium In
three (3) sodium out/two (2) potassium in |
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Term
| What are the types of vesicular transport? |
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Definition
| Exocytosis, Endocytosis, Transcytosis, Vesicular trafficking |
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Term
| Describe the differences of the types of vesicular transport. |
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Definition
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