Shared Flashcard Set

Details

Lecture 8
terms
27
Physiology
Undergraduate 3
02/17/2013

Additional Physiology Flashcards

 


 

Cards

Term
Mediated Transport
Definition
Transport of molecules across a membrane utilizing transmembrane proteins
Term
Facilitaed Transport
Definition
The passive movement of molecules across a membrane by way of a transport protein
Term
Carrier
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.
Term
Carrier Protein
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
Term
Glocose Carrier
Definition
A glucose carrier has a maximal transport rate of 10,000 glucose molecules per second.
Term
3 factors of faciliated diffusion
Definition
–The transport rate of the individual carriers
–The number of carriers in the membrane
–The magnitude of the concentration or electrochemic
Term
Channel
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
Term
Aquaporins
Definition
Highly selective pores that permit water, but not solutes to move across the membrane by diffusion.
Term
ion Channels
Definition
–Specific to the ions transported
–Ion move according to their electrochemical gradient
–Typically have and open and closed conformation
Term
Active Transport
Definition
Requires an energy input to move the transported solute up a concentration or electrochemical gradient.
Term
Primary Active Transport
Definition
Primary active transport uses ATP directly as an energy source.
Term
Secondary Active Transport
Definition
Secondary active transport is powered by a concentration gradient or an electrochemical gradient that was previously created by primary active transport
Term
ATPase
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
Term
Osmosis
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.
Term
Osmolarity
Definition
–Total solute concentration of a solution.
–Provides a measure of water concentration.
–High Osmolarity
–Low Water Concentration
Term
Tonicity
Definition
–The effective solute concentration of a solution.
–Relates to non-penetrating solutes
Term
Isoosmotic
Definition
–A solution Containing 300 mOsm/L of solutes.
–Includes both penetrating and non-penetrating solutes.
Term
Isotonic
Definition
–A solution containing 300 mOsm/L of solutes.
–Does not consider penetrating solutes.
Term
Hypoosmotic
Definition
–A solution Containing less than 300 mOsm/L of solutes.
–Includes both penetrating and non-penetrating solutes.
Term
Hypotonic
Definition
–A solution containing less than 300 mOsm/L of solutes.
–Does not consider penetrating solutes.
Term
Hyperosmotic
Definition
–A solution Containing greater than 300 mOsm/L of solutes.
–Includes both penetrating and non-penetrating solutes.
Term
Hypertonic
Definition
–A solution containing greater than 300 mOsm/L of solutes.
–Does not consider penetrating solutes.
Term
Lumen
Definition
Interior comparetment of a hollow organ or vessel
Term
Apical Membrane
Definition
Membrane on the side of an epithelial cell taht faces the lumen of a body cavity; the lumen-facing membrane
Term
Tight Junction
Definition
Barrier between lumen and Interstitial fluid
Term
Basolateral Membrane
Definition
Membrane on the side of an epithelial cell that faces the internal environment and is in contact with interstitial fluid; blood facing membrane
Term
Basement Membrane
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
Supporting users have an ad free experience!