Co-Transport Flashcards
What is co-transport ?
Co-transport is used to move glucose from the small intestine to the epithelial cells and then the blood, against its concentration gradient.
What processes does co-transport involve ?
Facilitated diffusion
Active transport
The Sodium-Potassium Pump
What is the Sodium Potassium pulp.
A transmembrane protein responsible for maintaining the electrical charge within a cell and maintains the resting potential.
Explain which ions are pumped in/ our and by which process ??
Na+ ions are pumped out into the extra cellular space while K+ ions are pumped into the intracellular fluid. Both by active transport.
Does this process require energy or not.
The Sodium Potassium pump required ATP because active transport is moving ions from a low to high concentration.
What happens as the ions are moved from a high to low concentration by the Sodium Potassium pump ?
An electrical tension is created between the extracellular space and the intracellular fluid.
How many of each ion and transferred and what does this cause.
3 Na+ ions are pumped out while 2 K+ ions are pumped out.
This means the extracellular space becomes a lot more positive than the intracellular fluid.
Explain in detail how the Sodium Potassium pump works. The process of transference.
3 Na+ ions bond to the pump. ATP then removes a phosphate group and becomes ADP. This makes the pump change shape so the 3 Na+ ions are pumped into the extracellular space.
Then 2K+ ions from the extracellular space bond to the pump. This removes the remaining phosphate group and reverted the pump to its original shape. The K+ ions are then pumped into the intracellular space.
