1.3b - Ion Transport Pumps and Generation of Ion Gradients Flashcards
For a solute carrying a net charge, the concentration gradient and the electrical potential difference combine to form…
the electrochemical gradient that determines the transport of the solute
A membrane potential (an electrical potential difference) is created when…
there is a difference in electrical charge on the two sides of the membrane
What is an example of an ion pump?
a sodium-potassium pump
Ion pumps use energy from…
the hydrolysis of of ATP to establish and maintain gradients
The sodium-potassium pump transports ions against a…
steep concentration gradient using energy directly from hydrolysis
The sodium-potassium pump actively transports sodium ions…
out of the cell
The sodium-potassium pump actively transports potassium ions…
into the cell
ASK MISS HATCHER
ABT 5
For each ATP hydrolysed…
3 sodium ions are transported out of the cell and 2 potassium ions are transported into the cell, establishing both concentration gradients and an electrical gradient
The sodium-potassium pump is found in most…
animal cells
The sodium-potassium pump accounts for a high proportion of…
the basal metabolic rate in many organisms
In the small intestine, the sodium gradient created by…
the sodium-potassium pump drives the active transport of glucose
In intestinal epithelial cells…
the sodium-potassium pump generates a sodium ion gradient across the plasma membrane
The glucose transporter responsible for glucose symport in the small intestine transports…
sodium ions and glucose at the same time and in the same direction
Sodium ions enter the cell…
down their concentration gradient
