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Definition
| Transport of molecules across a membrane utilizing transmembrane proteins |
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Term
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Definition
| The passive movement of molecules across a membrane by way of a transport protein |
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Definition
| A transmembrane protein that binds molecule on one side of a membrane and transports them to the other side of the membrane by a conformational change. |
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Definition
Regardless of the exact mechanism, the conformational changes occur randomly.
–Due to random thermal motion of carrier protein
–If a solute binds, it is transported |
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Definition
| A glucose carrier has a maximal transport rate of 10,000 glucose molecules per second. |
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Term
| 3 factors of faciliated diffusion |
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Definition
–The transport rate of the individual carriers
–The number of carriers in the membrane
–The magnitude of the concentration or electrochemic |
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Definition
–Is a transmembrane protein that transports molecules via a passageway or pore that extends from one side of the membrane to the other.
–Specific for the substrate they transport |
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Definition
| Highly selective pores that permit water, but not solutes to move across the membrane by diffusion. |
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Definition
–Specific to the ions transported
–Ion move according to their electrochemical gradient
–Typically have and open and closed conformation |
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Definition
| Requires an energy input to move the transported solute up a concentration or electrochemical gradient. |
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Term
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Definition
| Primary active transport uses ATP directly as an energy source. |
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Term
| Secondary Active Transport |
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Definition
| Secondary active transport is powered by a concentration gradient or an electrochemical gradient that was previously created by primary active transport |
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Term
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Definition
The membrane proteins that perform primary active transport function both as transport proteins and as enzymes
–Catalyze hydrolysis of ATP to release energy
–ATPases
–Na+ - K+ ATPase or Na+ - K+ pump |
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Term
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Definition
The diffusion of H2O through a selectively-permeable membrane separating solutions with different concentrations of solute.
•Water may move directly through the bilayer or be assisted by proteins which form water channels. |
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Definition
–Total solute concentration of a solution.
–Provides a measure of water concentration.
–High Osmolarity
–Low Water Concentration |
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Definition
–The effective solute concentration of a solution.
–Relates to non-penetrating solutes |
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Definition
–A solution Containing 300 mOsm/L of solutes.
–Includes both penetrating and non-penetrating solutes. |
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Definition
–A solution containing 300 mOsm/L of solutes.
–Does not consider penetrating solutes. |
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Definition
–A solution Containing less than 300 mOsm/L of solutes.
–Includes both penetrating and non-penetrating solutes. |
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Definition
–A solution containing less than 300 mOsm/L of solutes.
–Does not consider penetrating solutes. |
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Definition
–A solution Containing greater than 300 mOsm/L of solutes.
–Includes both penetrating and non-penetrating solutes. |
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Definition
–A solution containing greater than 300 mOsm/L of solutes.
–Does not consider penetrating solutes. |
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Definition
| Interior comparetment of a hollow organ or vessel |
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Definition
| Membrane on the side of an epithelial cell taht faces the lumen of a body cavity; the lumen-facing membrane |
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Definition
| Barrier between lumen and Interstitial fluid |
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Definition
| Membrane on the side of an epithelial cell that faces the internal environment and is in contact with interstitial fluid; blood facing membrane |
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Definition
| A layer of noncellular material that is relatively permeable to most substances; anchors the basolateral membrane and provides physical support for the epithelial layer |
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