Active Transport Flashcards
What is active transport?
Movement of molecules by a protiens carrier from a low to high concentration, against a concentration gradient, requiring ATP for energy.
Amino acids and glucose are absorbed by active transport where in the body?
Small intestine
Give an example of where active transport takes place in plants.
Mineral ions are absorbed from the soil from a low to high concentration.
What is co transport?
Coupled movement of substances across a cell membrane in a carrier protein. This may be in facilitated diffusion and active transport.
How does ATP release energy for active transport?
It binds to the carrier protein and hydrolyses.
Where are epithelial cells found?
On the surface eg; in the small intestine
In the small intestine, what process do both glucose and Na+ enter the cell in?
Facilitated diffusion
In the small intestine, how is the concentration gradient for Na+ maintained?
Na+ actively transported out of the cell, to keep the concentration gradient of sodium low in the cell.
In the small intestine, as Na+ is actively transported out, what ion is pumped in alongside it?
K+
How is the concentration gradient of glucose maintained during active transport in the small intestine?
Glucose leaves the cell by facilitated diffusion into the blood.
When things are diffusing into the blood during co transport from the small intestine, how is the concentration gradient maintained here?
Blood is constantly flowing, so the molecules that have left the epithelial cell can travel else where in the body.
